My "ProChrono Plus" has been checked against my buddy's Oehler 35 and found to be reliable when the light is right. I use it only between 10 AM and 3 PM on above freezing days.

High noon today was sunny and a sweltering 77 degrees F in the shade. Spring has sprung.

15 feet off the muzzle of the 23" barrel:

300-grain RNSP Hornady factory load, .375 Ruger:
Average for 10 shots = 2657.5 fps
2644
2633
2661
2648
2657
2667
2655
2663
2682
2665

270-grain SSP Hornady factory load, .375 Ruger:
Average for 10 shots = 2782.1 fps
2786
2777
2763
2792
2820
2763
2794
2796
2792
2738

Not bad for factory loads that are made up with ball powder that shakes in the case with some air space, and has 1.0 and 1.1 grains of powder extreme spread on the two loads of ball powder X about 84 grains and ball powder Y about 83 grains.

I was able to put 3 shots from each load into about 3/4" at 100 yards, not including the few flyers.

The rifle is breaking in.

When the 270-grainer is landing 2" high at 100 yards, the 300-grainer is zeroed for elevation at 100 yards, but is 1" to the left with my rifle. Close enough.

A full case of H4350 Extreme with powder charges weighed consistent to 0.1 grain ought to do even better, eliminate the flyers, and make talking about standard deviations of the loads worthwhile.

/

Alf,
Dave Scovill deserves to eat crow. He must have "measured" the .375 Ruger from an internet picture.

Craig Boddington is the only one who did not mislead. He had inside info, but he did not tell much except to say the base and rim are .532" and the case is "about 2.5 inches long."

It cannot be made from the 8x68S. It is not a Newton either. Not .522", not .525" at the base and rim.

The .375 Ruger is indeed a unique new cartridge based off no other.

The nominal base and rim are .532" max.
The new factory ammo measures about 0.530" for an easy fit. It is still 0.530" after firing too, to the nearest .001".

Fired cases are 2.581" average length.

Brass neck diameter is 0.402" before firing and 0.406" after firing.

Fired shoulder diameter is 0.516"

Neck length is a short 0.300", best I can tell.

The shoulder angle is about 25 to 30 degrees, my guess, as I have not seen the official specs. Has anyone yet?

Fired case water capacity before resizing is 101.1 grains gross.

Send some ketchup and crackers to Dave Scovill, he'll need it if anyone can get him to sit down to his crow. The nerve of that guy!

.....Thanks for posting those RIP......With the speed of the 270 gr , it kind of makes all the other mediums seem lacking .......Probably average 2825 or so with the 260 Accubonds and partitions and 2875 with 250 Trip Shocks ,,ect..probably beat 3000 fps with the 210 gr Trip Shocks or the light weight GS HV....................................I hope the factory ammo will go as fast in cold temps......Really looking foward to getting one of the Alaskans ...But I may need one of each...

I think (and hope) the 375 Ruger will mean some more variety on lighter bullets in the 375 bore.

Mike

Dear Mr. Berry:

Thanks for the chronographed velocities for the 375 Ruger. Will you be posting your handloaded velocities in the near future?

Sincerely,

Chris Bemis

Glad to see the numbers- I just picked up a new 375 Ruger yesterday- unfortunately, they didn't have the ammo yet from Hornady. But patience is a virtue!

What velocity loss do you guys think one would be getting out of the 20" Alaskan with those loads , what would the estimated loss be per inch?

quote:

Originally posted by Yale:
Dear Mr. Berry:

Thanks for the chronographed velocities for the 375 Ruger. Will you be posting your handloaded velocities in the near future?

Sincerely,

Chris Bemis

Jawohl, starting with Varget Extreme and likely ending with H4350 Extreme, two extremely good powders.

GSC HV and FN's of 265, 270, and 300 grain weights as available, should be interesting.

quote:

Originally posted by Tanoose:
What velocity loss do you guys think one would be getting out of the 20" Alaskan with those loads , what would the estimated loss be per inch?

Tanoose,
Running some numbers through Accuload3 is the best I can do right now:

Some top end loads compared:
Fastest predicted velocities obtained with:
RL22 for 300-grainer
MRP for 270-grainer

MV loss in going from 23" to 20" barrel:
300-grainers: -52.5 fps, -17.5 fps/inch
270-grainers: -57.5 fps, -19.2 fps/inch

MV gain in going from 23" to 26" barrel:
300-grainers: +42.5 fps, +14.2 fps/inch
270-grainers: +47.5 fps, +15.8 fps/inch

Predicted 20" velocities, therfore, in a 20" barrel with factory ammo, which is loaded with ball powders of charge weights very similar to the amount of extruded powder RL22 specified by AccuLoad3 for the 300-grainers:

300-grainer: 2605 fps
270-grainer: 2724.6 fps

Sounds pretty darn good for a 20" barrel,
maybe not such a bad idea after all.

AccuLoad III is great for playing around with this stuff, and the most accurate predictor out there of velocities and pressures that I have encountered so far. They are great at keeping you updated with any corrections or new additions/revisions. Get it at:

www.aement.com

I don’t think any of the big game you are likely to use 375 Ruger on at normal big game ranges will be able to tell if it was a 20,23or 26 inch barrel. Now if you are taking dogs at 600 yards I would recommend the 26 in barrel
Bill

I think this new caliber will really shine with the heavy for caliber Rhino bullets like the 350 grain and the 380 grain. All of sudden it will rival the .416s.

Just for comparison, I ran some Federal 375 H&H classic ammo with the 270 RN bullet across my chronograph last weekend and they clocked right at the factory spec 2700 fps out of my 24" barrel.

It seems to me that if you are going to compare 375 Ruger ammo speeds to 375 H&H ammo speeds you should use Hornady ammo in both cases. The Hornady website lists:

Ruger 270 gr.-2840
Ruger 300 gr.-2660
H&H 270 gr.-2870
H&H 300 gr.-2705
Seems the H&H still has a slight edge.The Rugers advantage to me is it can be used in a shorter action.

Larry

They list 2705fps for a 375H&H? And on the other thread about the Ruger a guy just chrono'd some of theirs and got 2435fps! Hmm...

.........Which other Tread???????

Top End Wood Custom, etc etc.

quote:

Originally posted by 90lx:
It seems to me that if you are going to compare 375 Ruger ammo speeds to 375 H&H ammo speeds you should use Hornady ammo in both cases. The Hornady website lists:

Ruger 270 gr.-2840
Ruger 300 gr.-2660
H&H 270 gr.-2870
H&H 300 gr.-2705
Seems the H&H still has a slight edge.The Rugers advantage to me is it can be used in a shorter action.

Larry

I don't think the laws of physics cease to exist within the magical H&H case. The bottom line is the Heavy Magnum H&H has a heavy charge at max pressure and it is fairly close to the Ruger charge. The published velocity differences you cite may be more attributed to the Heavy Mags being chrono'd out of a longer barrel than the Ruger ammo. I think they may use a 26" test barrel on the Heavy Mag H&H while they use a 23" test barrel on the Ruger. All in all, the advantage goes to the heavier charge when loaded to equal pressure. That is it, nothing magic.

You guys need to get over this; the 375Ruger is not a 375H&H and the 375H&H is not a 375Ruger. They are two different cartridges all together with the only commonality being they shoot the same bullets at the same approximate velocity and at the same approximate recoil. The 375Ruger is shorter and the 375H&H is longer. One does not preclude the other.

GVA

quote:

Originally posted by John S:
They list 2705fps for a 375H&H? And on the other thread about the Ruger a guy just chrono'd some of theirs and got 2435fps! Hmm...

Unless I'm misreading your post, it appears what you have posted is incorrect and misleading. In fact it appears false.

The guy tested Hornady 375H&H Heavy Mag over a chrono against Hornady 375Ruger ammunition. What he reported was the Ruger ammo was almost 250fps faster. He also reported that the Heavy Mag H&H ammo was no way near published velocity as it only clocked 2435fps.

GVA

...........John S I misunderstood your post ...The H&H chronographed @ 2435 or what ever it was......The Fed High Energy 375H&H Trophy Bonded load chronoed out of my 1999 Montana 24 " At 2710 fps avg vel for 10 shots from 18' from the chrony..The max variation was about 35 fps.....If Hornady used the same method to load 375 Ruger as they do to load the heavy mag ammono doubt it would be a little faster than the H&H ....But why??????A 270 gr 375 bullet at 2700 fps is just about ideal..A bit more velocity is fine but if the 20" barrel 375 Ruger does 2700 fps with a 270 grain bullet I sure won,t be disapointed....And I will use the rifle comfortably all over Alaska...

Perhaps a chamber temperature reading would be more usefull.It shouldn't be that difficult to do.If it is 77 degrees outside and 300 degrees in the chamber then the 77 reading is negligable.

quote:

Originally posted by GaryVA:

quote:

Originally posted by John S:
They list 2705fps for a 375H&H? And on the other thread about the Ruger a guy just chrono'd some of theirs and got 2435fps! Hmm...

Unless I'm misreading your post, it appears what you have posted is incorrect and misleading. In fact it appears false.

The guy tested Hornady 375H&H Heavy Mag over a chrono against Hornady 375Ruger ammunition. What he reported was the Ruger ammo was almost 250fps faster. He also reported that the Heavy Mag H&H ammo was no way near published velocity as it only clocked 2435fps.

GVA

So what is incorrect, misleading or falso about what I posted? This man chrono'd the two cartridges, saying both were made by Hornady. In any case, I used his results to show that my suspicions about some ammo being underloaded could be true. That was the point of the post.

Gumboot,
Your numbers for the Heavy Mag ammo are more like what I'd expect for a factory loaded round, meaning closer to published velocities.

Calm down Gary, John has said nothing false or misleading.I think the reference to 2435 fps was for standard .375 H&H loads of 300 grains, probably in a 24" barrel.

I have a buddy who chronographed the "Heavy Mag" 300-grain Hornady load and got barely over 2600 fps in his 24" M70, and so-so accuracy. If gumboot is getting +2700 fps with the same load, then he has a fast barrel, that is likely tighter and higher pressured, given the load is the same in both.

All seems right to me, if the larger .375 Ruger is getting 2657 fps in a 23" barrel with the help of Hornady's special ball powder, and the .375 H&H is getting slightly less with the voodoo load in a 24" barrel.

The Hornady ball powder is using only about 90% of the case net capacity available with the 300-grain Hornady bullet seated in the .375 Ruger.

Ok I think we have a 375 Ruger camp and a 375 H&H camp. Both are good rounds I don’t think a game animal shot with both rounds could tell you which is which. You aren’t going to win the other guy to your camp so just go shoot something so we can have a BBQ and DISCUSS witch worked better over a cold one.
Bill

RIP-
I believe Gumboot was shooting Federal Hi-Energy ammo, not the Hornady.

Right,
Maybe better voodoo by Federal than Hornady?
Nah, same voodoo.
Federal Hi-Energy or Hornady Heavy Magnum: same voodoo.
My comment still applies, I do believe.

Most of the factory ammo is advertised (hyped) well over what most of us get in a 24" barrel.

It is refreshing to see Hornady claim 300 grains at 2660 fps with the .375 Ruger, for unspecified barrel length, and I actualy got 2657.5 fps for 10 shot average, from a 23" barrel.

That is refreshingly honest.

Yes it is and I applaud them for loading the ammo to the advertised speeds. I truly wish they'd do the same for other cartridges.