Has anyone fooled with one yet. What are everyone’s thoughts.

You mean the 300 RSAUM? I think the reception was luke warm.

I think he means the new Hornady 300 prc

quote:

Originally posted by Quintus:
You mean the 300 RSAUM? I think the reception was luke warm.

No relationship to the RSUM or RUM.

The 300 PRC is a 2.58” CaseOAL derivative of the .375 Ruger; CartridgeOAL is 3.575” min - 3.700” max. SAAMI specifications 06/13/2018:
https://saami.org/wp-content/u...lic-Introduction.pdf

Hornady has brought out this year the 300 PRC. It is a necked down 375 Ruger case. The case is suppose to maximize 200 plus grain bullets.

Full article about it in the latest Guns & Ammo.

Interesting cartridge.

A very stout round from a standard action and might be appealing in the correct rifle configuration.

https://www.americanhunter.org...ook-hornady-300-prc/

Here is a good read.

I'm personaly looking forward to seeing a 7mm PRC in the future.....
but rather in the 2.8" variety

quote:

Originally posted by ted thorn:
https://www.americanhunter.org...ook-hornady-300-prc/

Here is a good read.

I'm personaly looking forward to seeing a 7mm PRC in the future.....
but rather in the 2.8" variety

Wouldn’t that be either a 7mm RCM or a .280 RCM?

This cartridge looks to be a heavy hitter indeed.
It will perform similar to the .300 ultra mag from what I can see. It is configured in such a way that, .300 win mags could easily be rechambered to the .300 PRC.
No belted case, longer neck for good grab on the bullet, and shoulder falls around the base of the bullet after it's seated. This maximizes powder capacity , without an overly long case.

quote:

Originally posted by Jeff mills:
This cartridge looks to be a heavy hitter indeed.
It will perform similar to the .300 ultra mag from what I can see. It is configured in such a way that, .300 win mags could easily be rechambered to the .300 PRC.
No belted case, longer neck for good grab on the bullet, and shoulder falls around the base of the bullet after it's seated. This maximizes powder capacity , without an overly long case.

Factory rounds are 3.7 wont fit inside a Winchester mag box or many others.

A Wyatt extended mag box should fix that.

quote:

Originally posted by Double BC:


Factory rounds are 3.7 wont fit inside a Winchester mag box or many others.

Was thinking the same thing. Mark V Wby and CZ or as mentioned above by Jeff mills the Wyatt box for Rem 700.

we can think whatever we want.
but.
unless we are willing to pony up the cash for a H-S or a G-S custom rifle we ain't gonna find out are we.

I am very happy with my .300 win mag in my Wnchester model 70.
But the throat in my chamber ain't gonna last forever.
When it goes south, the inexpensive way to go would likely be a reamer rental ,and a rechambered to the .300 PRC.
I have already modified my mag box to seat heavy bullets long, so it will probably fit mine as it is.
But, it will be a couple years till I need to worry about my chambers throat.
The deciding factor for a rebarrel or rechamber to this cartridge will be brass availability.
I don't look for too many factory rifles to be offered in the .300 PRC any time soon, if ever.
If a guy wants this one, a rebarrel or rechamber is the wise and economical way to get it.

Just checked my model 70 and I can fit a 3.644 in my box. That's likely close enough, but an extended box would be a smarter way to go if it gets to that point.
Not that difficult or expensive to do. At least that is how it seems to me.

Just picked up a Christensen Arms Ridgeline in the 300 PRC. Am excited to give it a go. I think that it will be a great long range rifle. Currently 15 rifle makers are producing rifles in the 300 PRC. I am sure that number will increase in the future.

I am not tempted.
Long ago had a .300 Lapua made up.
Mine is a .308/.338 Lapua with .300 Weatherby throat
of latest CIP iteration, Dave Manson reamer.
Done on a CZ 550 Magnum.
That is a good action for the .300 PRC.

Rip ...

I have a bunch of 300 RUMs but the problem they have that the PRC and Nosler variants don't is shorter case length. I have a RUM that is super accurate (shot it his am at 500 yards and hit my 2.75 inch aiming square) but the OAL is 3.84 inches, rendering this a single shot (in reality I can stuff shorter cartridges in the mag - might not be as accurate but better than a single shot).

My 28 Nosler uses 195 Bergers seated way out and they still fit in the magazine (Wyatt).

The solution to the RUM problem would seem to be to throat it super short.

RIP: I don't know about a CZ550 for a high accuracy rifle...Borden was the last action I used and must say I am pretty happy with it. Then again, if my long range rigs don't shoot 1/2 MOA at 500 they don't get used at long range.

Use enough gun,

I think you’ll really enjoy the 300 PRC. I had a rifle built with a proof carbon barrel and it shoots bug holes with Hornady 225 ELD-M. Took it to New Zealand and it was devastating on thin skinned game.

I think that the elegance of the 300 PRC design needs more discussion.



Positives:
The design fits in a standard long action rifle.
The neck is longer than the 300 WM and about standard bore diameter.
The extraction rim is not rebated.
The overall powder capacity is modest in comparison to the 300/378 while bettering the 300WM.
Historically, it is similar to the .30 Newton.
The .532 case head is a common bolt size for rifles.

Frankly, this cartridge should have been offered a decade ago instead of the 300 Ruger Compact Magnum, which basically put a 30-06 capacity in a short-action rifle. In terms of overall balance, this cartridge could be brought out in 338 and still give the 33 Nosler a run for its money.

Additional positives:

This 300 PRC comes with a .2494" freebore throat.
The freebore itself is fairly tight at .3088 groove diameter.

The head to shoulder length (2.1217) will provide a better parent to a 338 version than the grandparent 375 Ruger's 2.1797". That is because the expansion of the 30 caliber to 33 will cause the .308" neck to lengthen a tad, while compression of the 375 neck diameter would cause the neck length to shrink from the already short .305" of the 375Ruger.

In essence, the 300 PRC almost exactly duplicates the ballistic potential of the 300 Weatherby in a non-magnum action. For many knowledgable hunters this capacity has been the epitome of magnum balance in a .308" caliber. When we hear 300 PRC, we should think 300 Weatherby capacity, 300 Weatherby ballistics, in a little tighter, perhaps more accurate design.

And then a potential 338 PRC would be about the ballistic equivalent of the 340 Weatherby. Again, this is an admirable trait. While the 338WM may represent something of an ideal, balanced 338 magnum, the 340 Weatherby and a 338 PRC would probably rest on the top end of that "ideal capacity node" for hunting with a 338. Relatively speaking, the 338 WM is closer to the 340 Weatherby than the 308 Win is to the 30-06. (I've no fight to pick with the 338 RUM, Edge, 378, or Lapua, but those rounds are really designed for those who would take the hunt or target shooting beyond 500 yards.)

The Weatherby has been noted for using freebore in its chasing after velocity. These newer cartridges can also use their 1/4" parallel freebore for long high-BC monolithic bullets. However, long monolithic bullets may push the envelope on 3.6" actions, allowing approximately 1" of extending nose length on a bullet. For hunting over 500 yards hunters may want to modify the magazine lengths of a rifle.

For "normal" hunting 0-400 yards, these 300 PRC and "338 PRC" would work just fine even in little 3.4" actions. A nose length of 0.8" covers most of the traditional bullet weights even in monolithics.

Tanz,

I agree that the 300 PRC case specifications are the best option for .277, .284, .338. and .358 caliber wildcat derivatives of the 375 Ruger case. I've not taken the time to generate the QD wildcats for these calibers but will later...

I did generate the 300 PRC cartridge/chamber specification in QuickDesign and then imported it to QL for this type of "what ifs".

Here are the results (down and dirty - didn't look for best performing alternative mfg powder)...
QL results:
- 24" barrel length
- 3.4" COAL
- .308 212gr Hornady ELD-X 3077
- 78 gr Vihtavuori N560 (97.3 fill)
- 2950 fps w/4097 ft-lbs @ 64884 psi

QL Results:
- 24" barrel length
- 3.6" COAL
- .308 212gr Hornady ELD-X 3077
- 80 gr Vihtavuori N560 (95.6 fill)
- 2953 fps w/4105 ft-lbs @ 64317 psi

QL Results:
- 24" barrel length
- 3.7" COAL
- .308 212 gr Hornady ELD-X 3077
- 81.0 gr Vihtavouri N560 (94.8 fill)
- 2955 fps w/4110 ft-lbs @ 64107 psi

QL results:
- 24" barrel length
- 3.7" COAL
- .308 212 gr Hornady ELD-X 3077
- 91.0 gr Vihtavouri N570 (103,2 fill)
- 3022 fps w/4300 ft-lbs @ 63888 psi

I've not looked for 300 PRC cartridges so haven't purchased a box for measurements. Perhaps someone with factory Hornady ammunition can provide the average COAL for the ELD-X based ammunition.

Ok, I just ginned up a 264 PRC, for lack of a better terminology, in QD. I used:
1) The 2.58" case and base to shoulder lengths from the 300 PRC.
2) The neck and throat dimensions from the 6.5 PRC. And,
3) Then modified the parallel freebore length to match the 6.5 Creedmoor (0.199”).

I decided to run QL with 26” barrel length to see how it compares to the 6.5-300 Weatherby Mark V with 26” barrel and the 26 Nosler M48 with 26” barrel...
Here are the Weatherby listed performance for the 6.5-300 Weatherby cartridge:
1) 130 gr Scirocco – MV = 3476 fps
2) 140 gr VLD Hunting – MV = 3315 (presumed Berger bullet)

Here are the Nosler listed performance for the 26 Nosler cartridge:
3) 129 gr AccuBond LR – MV = 3400 fps

Here the QL results @ 3.4” COAL:
1) 129 gr AccuBond LR – MV = 3436 fps w/4584 ft-lbs @ 63852 psi / 84.5 gr VV N570 @ 95.5 fill
2) 130 gr Sicrocco – MV = 3424 fps w/4588 ft-lbs @ 63994 psi / 84.0 gr VV N570 @ 95.3 fill
3) 140 gr Berger VLD Hunt – MV 3321 fps w/4649 ft-lbs @ 63760 psi / 82.5 VV N570 @ 93.8 fill

Here the QL results @ 3.6” COAL:
1) 129 gr AccuBond LR – MV = 3432 fps w/4573 ft-lbs @ 63755 psi / 86.0 gr VV N570 @ 94.4 fill
2) 130 gr Sicrocco – MV = 3420 fps w/4578 ft-lbs @ 63905 psi / 85.5 gr VV N570 @ 94.1 fill
3) 140 gr Berger VLD Hunt – MV 3319 fps w/4642 ft-lbs @ 63710 psi / 84.0 VV N570 @ 92.7 fill

LOL… It appears that a 264 PRC actually prefers the 3.4” COAL as the 3.6” COAL delivers a few fps less for 1.5 grs of additional powder…

Ok, just for you Tanz I just ginned up a 330 PRC, for lack of a better terminology, in QD.
I used:
1) The 2.58" case and base to shoulder lengths from the 300 PRC.
2) The neck and throat dimensions from the 338 RCM. And,
3) Then modified the parallel freebore length 0.2409”.

Comparison with the 338 Norma Magnum cartridge; both with 26” barrel length.
338 Norma Magnum cartridge @ 3.681” COAL:
Norma website: 300 gr Sierra Match King – MV = 2660 fps

QL results for 330 PRC @ 3.681” COAL:
300 gr Sierra Match King LR – MV = 2668 fps w/4740 ft-lbs @ 62769 psi / 80.0 VV N560 @ 97.0 fill


Comparison with the 338 Remington Ultra Magnum; both w/26” barrel length.
338 Remington Ultra Magnum:
3.575” COAL:
1) Nosler Custom: 200 gr AccuBond – MV: 3150 fps w/4405 ft-lbs
2) Nosler Trophy Grade: 250 gr AccuBond – MV: 2850 fps w/4508 ft-lbs
3.590” COAL:
3) Nosler Trophy Grade: 300 gr AccuBond – MV: 2600 fps w/4502 ft-lbs

QL results for 330 PRC:
3.575” COAL:
1) 200 gr AccuBond – MV: 3139 fps w/4375 ft-lbs @ 63390 psi / 83.0 gr VV N550 @ 95.0 fill
2) 250 gr AccuBond – MV: 2907 fps w/4691 ft-lbs @ 62771 psi / 84.0 gr VV N560 @ 101.8 fill
3.590” COAL:
3) 300 gr AccuBond – MV: 2659 fps w/4710 ft-lbs @ 63463 psi / 78.0 gr VV N560 @ 98.8 fill


Comparison with 338 Winchester Magnum; both w/24” barrel length:
338 Winchester Magnum @ 3.340” COAL:
Nosler Custom: 200 gr AccuBond – MV: 2950 fps w/3864 ft-lbs

330 PRC QL results @ 3.340” COAL:
200 gr AccuBond – MV: 3034 fps w/4089 ft-lbs @ 61282 psi / 79.0 gr VV N550 @ 95.9 fill

And as FYI… w/24” barrel:
330 PRC QL results @ 3.400” COAL:
1) 200 gr AccuBond – MV: 3012 fps w/4028 ft-lbs @ 59426 psi / 79.0 gr VV N550 @ 94.5 fill
2) 200 gr AccuBond – MV: 3063 fps w/4166 ft-lbs @ 62989 psi / 80.5 gr VV N550 @ 96.4 fill
3) 250 gr AccuBond – MV: 2818 fps w/4408 ft-lbs @ 61377 psi / 81.0 gr VV N560 @ 102.8 fill
330 PRC QL results @ 3.600” COAL:
1) 200 gr AccuBond – MV: 3088 fps w/4235 ft-lbs @ 63783 psi / 83.5 gr VV N550 @ 95.0 fill
2) 250 gr AccuBond – MV: 2860 fps w/4540 ft-lbs @ 63148 psi /84.5 gr VV N560 @ 101.7 fill


I think the 330 PRC does pretty well regardless of the COAL in comparison to factory cartridges...

quote:

I think the 330 PRC does pretty well regardless of the COAL in comparison to factory cartridges...

Jim, thank you for the statistical comparisons. They do confirm the excellency of the 338-PRC design, which is no surprise since it is so close to the 340 Weatherby in ballistics.

I see that you used the Accubond as a baseline bullet. That may be as good as any for the computer, but I would prefer a more substantial bullet for real-life hunting, including both up-close and out-far shots. An intriguing new bullet on the scene is the Hammer Hunter. The 213 grain HH has a BC of .536, not too shabby. Heavier Hammers are available, too, like the 260gn HammerHunter with a BC .650, and the 282gn SledgHammer with BC .553. Personally, we've used the 225gnTTSX (BC .514) with great success and with only pass-throughs so far. Barnes also has a 250gn LRX with a BC .602. All of these would be more reliable bullets for both close and distant hunting.

PS:
I'm curious, what is the conversion possibility for rechambering a 338WM to 338 PRC?

My guess without seeing the chamber diagrams is "no problem."

I built mine on a 700 Rem and converted to the Wyatt's magazine box. Hornady's 212 ELD-M loading is seated at 3.700.

quote:

Originally posted by 416Tanzan:

quote:

I think the 330 PRC does pretty well regardless of the COAL in comparison to factory cartridges...

Jim, thank you for the statistical comparisons. They do confirm the excellency of the 338-PRC design, which is no surprise since it is so close to the 340 Weatherby in ballistics.

I see that you used the Accubond as a baseline bullet. That may be as good as any for the computer, but I would prefer a more substantial bullet for real-life hunting, including both up-close and out-far shots. An intriguing new bullet on the scene is the Hammer Hunter. The 213 grain HH has a BC of .536, not too shabby. Heavier Hammers are available, too, like the 260gn HammerHunter with a BC .650, and the 282gn SledgHammer with BC .553. Personally, we've used the 225gnTTSX (BC .514) with great success and with only pass-throughs so far. Barnes also has a 250gn LRX with a BC .602. All of these would be more reliable bullets for both close and distant hunting.

Tanz,

I used the AccuBond bullet because that was the single bullet listed amongst the factory cartridges allowing an across board comparison. I tried to keep the comparisons as much “apples to apples” by using the identical bullets, factory barrel lengths, and by keeping the relating PRC cartridge “under” the SAAMI maximum-psi for the factory cartridges.

For the bullets you’ve noted – 330 PRC:
Barnes .338 225 gr TTSX 30430:
26’ Barrel Length:
3.675” COAL – MV: 3014 fps w/4539 ft-lbs @ 60932 psi / 86.0 gr VV N560 @ 101.5 fill
3.575” COAL – MV: 3001 fps w/4498 ft-lbs @ 60634 psi / 84.5 gr VV N560 @ 102.3 fill
3.400” COAL – MV: 2922 fps w/4265 ft-lbs @ 63353 psi / 74.5 gr VV N550 @ 94.4 fill
24’ Barrel Length:
3.675” COAL – MV: 2955 fps w/4363 ft-lbs @ 60932 psi / 86.0 gr VV N560 @ 101.5 fill
3.575” COAL – MV: 2943 fps w/4327 ft-lbs @ 60634 psi / 84.5 gr VV N560 @ 102.3 fill
3.400” COAL – MV: 2872 fps w/4121 ft-lbs @ 63353 psi / 74.5 gr VV N550 @ 94.4 fill

Barnes .338 265 gr LTX BT 30434:
26’ Barrel Length:
3.675” COAL – MV: 2827 fps w/4702 ft-lbs @ 64478 psi / 81.0 gr VV N560 @ 100.8 fill
3.575” COAL – MV: 2813 fps w/4656 ft-lbs @ 64217 psi / 79.5 gr VV N560 @ 101.7 fill
3.400” COAL – MV: 2922 fps w/4265 ft-lbs @ 63353 psi / 74.5 gr VV N550 @ 94.4 fill
24’ Barrel Length:
3.675” COAL – MV: 2776 fps w/4534 ft-lbs @ 64478 psi / 81.0 gr VV N560 @ 100.8 fill
3.575” COAL – MV: 2763 fps w/4492 ft-lbs @ 64217 psi / 79.5 gr VV N560 @ 101.7 fill
3.400” COAL – MV: 2757 fps w/4473 ft-lbs @ 61415 psi / 76.0 gr VV N560 @ 102.1 fill

Barnes .338 280 gr LTX BT 30432:
26’ Barrel Length:
3.675” COAL – MV: 2747 fps w/4691 ft-lbs @ 64350 psi / 79.0 gr VV N560 @ 99.8 fill
3.575” COAL – MV: 2725 fps w/4616 ft-lbs @ 63659 psi / 77.0 gr VV N560 @ 100.7 fill
3.400” COAL – MV: 2703 fps w/4542 ft-lbs @ 63538 psi / 74.5 gr VV N560 @ 102.4 fill
24’ Barrel Length:
3.675” COAL – MV: 2698 fps w/4526 ft-lbs @ 64350 psi / 79.0 gr VV N560 @ 99.8 fill
3.575” COAL – MV: 2677 fps w/4492 ft-lbs @ 63659 psi / 77.0 gr VV N560 @ 100.7 fill
3.400” COAL – MV: 2657 fps w/4388 ft-lbs @ 63538 psi / 74.5 gr VV N560 @ 102.4 fill

My current version of QL doesn’t list the HammerHunter or SledgeHammer bullets; also doesn’t list the 250 LRX BT. I am still looking for my 12/2018 update disk (new pc).

quote:

Originally posted by Timan:
I built mine on a 700 Rem and converted to the Wyatt's magazine box. Hornady's 212 ELD-M loading is seated at 3.700.

Timan did you load your own or use factory ammunition? If factory, were they loaded to 3.700" or closer to 3.675" COAL?
Thanks!

quote:

Originally posted by 416Tanzan:
PS:
I'm curious, what is the conversion possibility for rechambering a 338WM to 338 PRC?

My guess without seeing the chamber diagrams is "no problem."

Tanz,

That is a good question and comparing "my mockup" of the 330 PRC, specifically the chamber dimensions in the full neck area, vs your factory 338 WinMag chamber is one of those "maybe will maybe won't" scenarios.

Truly need a chamber cast of your 338 WinMag chamber for a truer comparison.
Potential issues:
1) The 338 WinMag is a larger chamber diameter at the belt Counterbore Diameter (parallel 0.535" diameter for 0.220" length) and at the Throat/Freebore Start Diameter (0.345").
2) The 330 PRC for these two dimensions is 0.5346 tapered from Counterbore through Shoulder Diameters with a diameter of 0.533” at the 0.220” specification. Plus the Throat/Freebore Start Diameter is 0.3385”.

I don’t perceive issue 1 being eliminated unless your 338 WinMag chamber is under-maximum specification at that dimension while the 330 PRC finish reamer is at maximum specification. Perhaps polishing the slight ridge at the 0.220” dimension would eliminate any potential chamber issues at that point.

Perhaps the extra chamber length of the 330 PRC, Length to Freebore Throat Intersection, can eliminate the all or most of issue 2. I’ll print both chambers views and do some measuring…

quote:

Originally posted by capoward:

quote:

Originally posted by 416Tanzan:
PS:
I'm curious, what is the conversion possibility for rechambering a 338WM to 338 PRC?

My guess without seeing the chamber diagrams is "no problem."

Tanz,

That is a good question and comparing "my mockup" of the 330 PRC, specifically the chamber dimensions in the full neck area, vs your factory 338 WinMag chamber is one of those "maybe will maybe won't" scenarios.

Truly need a chamber cast of your 338 WinMag chamber for a truer comparison.
Potential issues:
1) The 338 WinMag is a larger chamber diameter at the belt Counterbore Diameter (parallel 0.535" diameter for 0.220" length) and at the Throat/Freebore Start Diameter (0.345").
2) The 330 PRC for these two dimensions is 0.5346 tapered from Counterbore through Shoulder Diameters with a diameter of 0.533” at the 0.220” specification. Plus the Throat/Freebore Start Diameter is 0.3385”.

I don’t perceive issue 1 being eliminated unless your 338 WinMag chamber is under-maximum specification at that dimension while the 330 PRC finish reamer is at maximum specification. Perhaps polishing the slight ridge at the 0.220” dimension would eliminate any potential chamber issues at that point.

Perhaps the extra chamber length of the 330 PRC, Length to Freebore Throat Intersection, can eliminate the all or most of issue 2. I’ll print both chambers views and do some measuring…

Sounds like a barrel set-back of about .3" would clean up the case head issues. Would that clean up the neck/throat, too?

A Tikka comes with a 24.4" barrel, so one could play with .4" and still have a standard 24".

My current US 338 is a Ruger Hawkeye. Maybe Ruger will come out with a 338 PRC before I or my son get around to one. (My son may be looking for a US 338, but not this year.)

quote:

Originally posted by 416Tanzan:
Sounds like a barrel set-back of about .3" would clean up the case head issues. Would that clean up the neck/throat, too?

A Tikka comes with a 24.4" barrel, so one could play with .4" and still have a standard 24".

My current US 338 is a Ruger Hawkeye. Maybe Ruger will come out with a 338 PRC before I or my son get around to one. (My son may be looking for a US 338, but not this year.)

Yes the setback of .3” or .4” would definitely eliminate all issues with rechambering a 338 WinMag to 330 PRC.

Regarding Ruger M77 MkII in 338 WinMag. Again barrel setback would be required; I think 2 full thread setback would be sufficient to eliminate all issues with rechambering the 338 WinMag to 330 PRC.

Were I purchasing a new 338 WinMag rifle to rechamber to 300 PRC, I’d be looking at one of the FN manufactured Winchester M70 Extreme Weather Stainless rifles. Benefits are standard action screw lugs (no front angled lug) and comes with a full-length aluminum bedding block in an all-weather synthetic stock (B&C Medalist). Comes with a 26” barrel which would still be around 25.5” after barrel setback so little loss in performance. Plus it’s fairly easily modifiable for 3.635” or 3.8” internal magazine box length.

Of course, as Jeffe has demonstrated, the Ruger M77 MKII can fairly easily be modified to accommodate a 375 H&H length magazine box so that’s always an option as well.

quote:

Of course, as Jeffe has demonstrated, the Ruger M77 MKII can fairly easily be modified to accommodate a 375 H&H length magazine box so that’s always an option as well.

Today the Rugers are Hawkeye. Did you mean Hawkeye or the older MKII?

quote:

Originally posted by 416Tanzan:

quote:

Of course, as Jeffe has demonstrated, the Ruger M77 MKII can fairly easily be modified to accommodate a 375 H&H length magazine box so that’s always an option as well.

Today the Rugers are Hawkeye. Did you mean Hawkeye or the older MKII?

Actually I was referring to the older MKII, 'cause that's what I'd owned, but it'll relate to either model.

Ok Tanz, you wanted some longer high-BC bullets…how about these. I created .338 caliber CEB bullets in QL:
225 gr Lazer Tipped HP: .630 G1 BC; .312 G7 BC
250 gr Lazer Tipped HP: .670 G1 BC; .357 G7 BC
265 gr Lazer Tipped HP: .780 G1 BC; .399 G7 BC

Here are the results – all using 26” barrel length:
3.675” COAL:
265 gr LZR TPD HP – MV: 2813 fps w/4655 ft-lbs @ 64884 psi / 80.0 gr VV N560 @ 102.2 fill
250 gr LZR TPD HP – MV: 2859 fps w/4537 ft-lbs @ 60606 psi / 80.5 gr VV N560 @ 102.6 fill
225 gr LZR TPD HP – MV: 2979 fps w/4434 ft-lbs @ 58315 psi /84.0 gr VV N560 @ 102.8 fill
3.575” COAL:
265 gr LZR TPD HP – MV: 2781 fps w/4551 ft-lbs @ 61306 psi / 78.0 gr VV N560 @ 102.4 fill
250 gr LZR TPD HP – MV: 2808 fps w/4378 ft-lbs @ 57777 psi / 78.0 gr VV N560 @ 102.2 fill
225 gr LZR TPD HP – MV: 2945 fps w/4334 ft-lbs @ 63720 psi / 76.0 gr VV N550 @ 95.5 fill
3.400” COAL:
265 gr LZR TPD HP – MV: 2705 fps w/4305 ft-lbs @ 57168 psi / 74.0 gr VV N560 @ 102.2 fill
250 gr LZR TPD HP – MV: 2748 fps w/4192 ft-lbs @ 55192 psi / 74.5 gr VV N560 @ 102.6 fill
225 gr LZR TPD HP – MV: 2930 fps w/4268 ft-lbs @ 63367 psi / 73.5 gr VV N550 @ 96.9 fill

I like the CEB Lazer Tipped HPs 'cause they're high-BC copper bullets that expand down to 1200 fps which equates to +1000 yards impact range...so pretty much guaranteed to properly expand from the muzzle out through any normal hunting range for impact velocity.

quote:

Originally posted by capoward:

quote:

Originally posted by Timan:
I built mine on a 700 Rem and converted to the Wyatt's magazine box. Hornady's 212 ELD-M loading is seated at 3.700.

Timan did you load your own or use factory ammunition? If factory, were they loaded to 3.700" or closer to 3.675" COAL?
Thanks!

I checked Hornady’s online reloading data for the 300 PRC yesterday; all loading referenced a 3.575” COAL with a 24” barrel. In QL I easily matched the factory published ELD-X and ELD-M loadings with multiple powders using these specifications. In fact, the largest velocity gain 3.700” COAL vs 3.575” COAL over the factory published ballistics was to use a 26” barrel rather than the 24” barrel Hornady referenced in their online reloading site.

I think I understand Hornady’s concept a little better with their SAAMI published Min-3.575” COAL and Max-3.700” COAL specifications. The minimum COAL will allow easily matching Hornady’ ballistics from standard Remington M700 and Winchester M70 standard factory long magazines. Whereas the 3.700” COAL will better allow usage of the heavier monometal bullets which are longer than their C&C counterparts.

Timon; what performance are you getting and what barrel length are you using?

quote:

Originally posted by AnotherAZWriter:
I have a bunch of 300 RUMs but the problem they have that the PRC and Nosler variants don't is shorter case length. I have a RUM that is super accurate (shot it his am at 500 yards and hit my 2.75 inch aiming square) but the OAL is 3.84 inches ...

RIP: I don't know about a CZ550 for a high accuracy rifle...Borden was the last action I used and must say I am pretty happy with it. Then again, if my long range rigs don't shoot 1/2 MOA at 500 they don't get used at long range.

AAZW,

What a coincidence!
Most CZ 550 Magnum magazine boxes are 3.84" long inside the box.
That action is plenty accurate for a sporting rifle, capable of 0.5 MOA.
And besides, I am cheap!
I am not interested in chasing marginal tenths of an MOA for more than tenths of a dollar.
My dimes are more fun when spent the way I spend them.

I see that 416Tanzan and Jim are going wild on the numbers.
That is good, but more pictures are needed.
See picture below.

I did the .264 Ripmoor several years ago, on a Winchester M70 donor rifle (7mmRemMag). Worked well,
holds three down, Krieger barrel.

I did the .458 WinRuger last year by simply rechambering a Whitworth MarkX .458 WIN, leaving the remnant .458 WIN throat.
Only holds two down in the original, skinnier Mauser box, needs a drop floor plate for just a little more room.

I put the dimensions on an RCBS LOAD Cartridge Designer "picture" file for a 300 PRC and a ".338 PRC" just for fun.
Here's the picture:



Rip ...