Whats this good for pushed as fast as Reloder 22 can push it.

my hunting partner's father use to load for my 7mm mag, he used 67gr IMR 4831, with hornady 162gr btsp, very acurate

quote:

Originally posted by rickt300:
Whats this good for ...

Deer and Hogs for sure!

Rick, the SD of that bullet is the same as a 165 gr in 30 cal. You should be able to take whatever the 165 will take.I'd say Cow elk or Caribou at the top end.

I guess the partition will hold up well enough for any angle hits on deer and break all necessary bones on a pretty big hog. anyone have much experience using this bullet pushed to 3200fps?

quote:

Originally posted by rickt300:
I guess the partition will hold up well enough for any angle hits on deer and break all necessary bones on a pretty big hog. anyone have much experience using this bullet pushed to 3200fps?

The only problem you will have with that bullet at that speed and a hog is the labor of dressing it and butchering.

Very good bullet but performs best between 2600 and 2900 fps impact velocity.

I could easily load it to 2900-3000fps. Do you think thats necessary?

Hey Rick, My current 7mmRemMag has a "Slow Barrel" compared to the last one I had. The best I can get at a SAFE MAX with the 140gr Partition is 3050fps.

But..., if you eyeball an External Ballistics Chart, it doesn't take much distance for your 3200fps to be at 2900fps. I've never had a problem with Partitions when they start at 3200fps(or higher), so I'd be interested in Doc's thoughts on the lower Velocity Impact levels too.

By the way, keep an eye out for erratic Pressure Fluctuations with the RL-22. It varied a good bit in my current 7mmRemMag, but it may not happen at all in your rifle.

Best of luck to you and stick one of those Partitions in a BIG OLE GOOD `UN!!!

quote:

Originally posted by rickt300:
I could easily load it to 2900-3000fps. Do you think thats necessary?

No. Just repeating Nosler from one of my numerous phone calls. The bullet will be fine loaded at MV over 3000 fps, but the results on bullet performance are optimal when impact velocity is between 2600 and 2900 fps.

In my 7mag, I've never had to load the partition, either the 140 or 150 very hot. The bullet is just SOO devastating on game. I'd shoot for accuracy with that bullet long before I'd consider juicing it to see how accurate the faster loads are.

If you happen upon a nice consistant load at 3000, leave it....same for 2900 fps. But I wouldn't download on purpose.

I checked my records and from 1992-1998, my partition load was 2970. I killed at least 15-20 deer with that load in the south, and 3-4 bigger deer in Missouri. No matter the shot placement, angle, or distance (up to just under 300 yards), I never recovered a bullet. Just meat.

If the impact velocity is near top end, most if not all of the front core can be shed completely, thus leaving the small rear core to continue the path of destruction. However, the word is, the remaining shank can tumble easier, and perhaps travel off course of original shot placement...fwiw, if that is even a concern.

"Erratic pressure fluctuations", Hmmm I haven't had my present 7MM mag long but it is a like new 1971 Reminton BDL. My first worked up loads used the 175 grain Hornady Spire point and Speers 160 grain Hotcor. I worked up to 64.0 grains of RL22 with the 175 Hornady and got no pressure signs but very fine accuracy. I loaded the same charge under the Speer bullet and got fine accuracy also. Bullet POI is identical with the two bullets. If I start getting poor accuracy does this mean I am getting pressure variation? I expect to easily go up to 66 grains using the 140 grain Nosler Partition and the 150 grain Ballistic tip with no problems. In fact I expect to work up the load with the Ballistic tips and use the same data for the Partition. I am more interested in accuracy than the last FPS but I would like to end up in the top 10 percent.

Hey Doc, Thanks for the info.

quote:

Originally posted by rickt300:
... If I start getting poor accuracy does this mean I am getting pressure variation? ...

Hey Rick, You may not see it at 100yds or 200yds, but as the distance increases, it should begin to open the groups.

I noticed it by watching the Pressure Ring Expansion(PRE). It held fairly steady increases until I neared the MAX and then it showed wide variances in the Expansion(aka erratic Pressure) - with all the RL Powders.

Not sure if you can see it in a larger Standard Deviation with a Chronograph because I never bothered to chronograph the RL Powder Loads. But logically it should show up if your RL Powders do the same as mine did near MAX.

If your accuracy is acceptable for the distances you Hunt and there are no "other" Pressure Indicators, enjoy the Load and Kill a bunch of Game. Plenty of folks use the RL Powders and recommend them highly.

As long as you are aware the potential for the problem exists, then you can watch for it as you Develop your Loads.
-----

I'm not a fan of working up a Load with one Bullet and then just sticking a different Bullet in that same Load. It may never create a problem for you, but it has the potential to create over Pressure conditions and less than optimum accuracy for the new Bullet.

Best of luck to you.

I have had good luck working up a full pressure load with the heaviest bullet I may use and using the same charge for the lighter bullets. Very similar POI seems to be the bonus and the lighter bullet load is easier on brass. I normally advance my powder charge till I see any sign of brass deformation on the case head like ejecter hole marks or writing being reduced then reduce it one grain. This often happens before magnum primers show any real sign of flattening. But I am a machinist and have several 0-1" micrometers I'll check for pressure ring variation on my next run of loads.

Nothing wrong with that Method from where I sit.

quote:

Originally posted by rickt300:
... I am a machinist and have several 0-1" micrometers I'll check for pressure ring variation on my next run of loads.

I've found that in order to get the most accurate readings, you need to use the 0.0001" capable Micrometer a bit different than you normally would.

When you get ready to take the measurements, Rotate the Pressure Ring between the Anvils and STOP if you feel any resistance at all. Open the Mics until you can completely Rotate the Pressure Ring without it "hanging".

Then remove the Mic, tighten 0.0001" and try it again. If it will Hang at 0.4699" but will not Hang at 0.4700" then you have it - a PRE of 0.4699". You basically use the Mic as an adjustable Go / No-Go Gauge.

I've seen people try to use the Rachet Spindle and take multiple readings around the Case, but due to the Random Placement, it just isn't as accurate as determining the MAX Diameter.

If I see more than 0.0004" variation at one Load Level on Cases that have less than 10 firings, then I consider that erratic.

Best of luck to you.

I was going to ask how much variation I am looking for, thanks. I make aircraft parts to tolerances of + or - .0003, rest assured I can get to the hill on this one. I don't know why I never used this method before.

Hey Rick, Since you use Mics daily, you understand the precision which is possible.

The only people I've ever seen deride the Method generally want their measurements to fail so they can justify spending HUGE amounts of money on HSGSs(Haphazard Strain Gauge Systems) which can't be Calibrated outside a Lab, use Guessed at Chamber Dimensions, include a Fudge Factor to make the Software get "somewhere", and they have to Glue a Strain Gauge on their firearm. Pitiful!

By the way, Case Head Expansion is also useful, especially on the easy to measure Belted Cases. Check here for a more defined list on how to use CHE and PRE when reloading.

Concerned that my last years load of 64.0 grains of Reloder 22 pushing a 175 grain Hornady spire loint migh have been a bit hot I measured CHE acros the belt. In no case was the diameter larger than that on a once fired factory load from the same lot and maybe even box the reloads were built from. I believe that if there is no marking or deformation of the case head at all the load is most likely a safe one. I have seen many a factory load that pushed brass into the ejector hole or slot but my reloads won't do it because I'll back off at the first sign of it.

quote:

Originally posted by rickt300:
...I measured CHE acros the belt. In no case was the diameter larger than that on a once fired factory load from the same lot and maybe even box the reloads were built from.

Hey Rick, I measure CHE a bit different than that. Click on the above Link and you will see what I do.

quote:

I believe that if there is no marking or deformation of the case head at all the load is most likely a safe one. I have seen many a factory load that pushed brass into the ejector hole or slot but my reloads won't do it because I'll back off at the first sign of it.

I agree. And the Cases can "Work Harden" over time which can also skew results if the cases have been shot a good bit.

Long ago I worked up some Loads in Cases that had been shoot a good bit(no idea on the times loaded) and got a nice accurate Load. Went to "new" cases and had Loose Primer Pockets after the very first shot in each case. Thought it might be a bad Lot of Cases, but that wasn't it, just too HOT!

I do want top performance in my rifles when Hunting. But approaching the SAFE MAX takes a bit more effort for me than just loading a mid-range Load, as I feel sure you know.

Best of luck to you.

I no longer have the 7MAG, but my favorite deer load was the 140 Partition with IMR4350. I ran it at 3100fps and it worked awesome on GA whitetails.
I also liked 160gr Sierra BTSP's @ 2850fps in the 7MAG, but the 140Part was my favorite.

I have gotten some very soft new brass from Federal and Remington. It may just be better to load new brass a couple times with a moderate load before working up a warm load.

Hey Rick, I agree.

My initial shots through a set of cases are Fire Forming. I just go out and have fun blasting away. Normally do a lot of off-hand shooting with the Fire Forming Loads.

Had a Califoney buddy mention to "mark" a Case if it throws an unexpected flier. So, I put a Black Mark in the Extraction Groove. Then if it happens again to remove that specific Case from that Lot. So simple.

quote:

Originally posted by rickt300:
Whats this good for pushed as fast as Reloder 22 can push it.

Aren't you glad you asked?

I started with 64.0 grs. of R-22 and made it up to 68.0 grs. and liked the way it shot best at 66.0 grs. No indications of excess pressure just very good accuracy thru the entire range.

This 7MM Remington magnum is the second rifle I have owned so chambered. Seems very flexible and easy to make good loads for. It is all I need in a big cased 7MM.