A recent acquisition, a 98 Mauser done up in 375-06 AI has me looking for info.
I have been fortunate to find some but it would really be nice to hear from anyone who has had or does have hands-on experience with one.
Any information will be most appreciated..

Look for data for the 375 Brown Whelen and adjust the charge down for your slightly smaller case.

I shoot a 380PDK which is a touch larger, I love it. I run a lot of 260 accubonds through it and drop to 235s for milk jugs.

About 5% over a std 375/06 or 5% less than a 375 Brown Whelen, in powder charges..should get you started, but go carefully, your flying by the seat of your pants, and old wildcatters are primer poppers for sure. A chronograph is a must for wildcatters IMO.

I shot a 375x62 for some time, among others,..A 9.3x62 Mauser necked up to .375..I got 2500 FPS with a 300 gr bullet, so you should be able to do almost the same. That's where I load my std 375 H&H as bullets perform better on game at that speed.

Get a copy of P.O. Ackley book, check out the internet, study the stats, always start low and work up looking for pressure signs, keeping in mind that one pressure sign may be bad or might be not so bad, but add one more to it and you must back off..its tricky!

Thanks Paul K. & Ray, always enjoy your posts, keep up the good work.
I will be careful.... must keep my 69 yr. old hide intact..

You will find that with the 260s you will give up very little to the H&H. With the 300gr the H&H will pull ahead. I don't have my favorite powders on this laptop but can post them when I get home Sunday or Monday.

Well you didn't ask but IMR 4895 and RL15. I also tried Varget but pretty much stay with IMR 4895.

With my 375-06 I get 2600fps with the nosler 260 accubond and a 24 in barrel. I use imr 4320.

IMR-4320 is A much overlooked powder in 30-06 based wildcats such as the 375-06 or the 338-06.

Lots of info on the 375 Hawk/scoville. Most load data for it is kept to the same pressure level as 30-06, 48,000 cup area. Still, you should drop the loads a bit and work up. H4895 and Re 15 are both good powders to try, I use both in my 375 H/S.

Scoville was the first to do a .375 on a 9.3x62 and he shortened the case as I recall?? and got some decent velocity and its been used quite a bit on Alaskan Brown Bear by several guides...

I am thinking the Hawk/Scoville is based on a blown out 30-06 case, correct?

My rifle was simply a 9.3x62 case necked up to .375. I got 2500 FPS in my top loads, it was a light rifle and recoil was right up there, but it was accurate and deadly..I have traditionally loaded my 375 H&H with 300 gr. Woodleighs or Noslers at 2500 FPS..

I think today the 375 Ruger fills that same notch quite well using the same actions.

quote:

Originally posted by Redside:
With my 375-06 I get 2600fps with the nosler 260 accubond and a 24 in barrel. I use imr 4320.

This is impressive - 3900 ft# of energy at the muzzle, and with an -06 case.

Never could understand why many people stuck their noses in the air over the '06 case size...depending on whether it is standard or wildcat you can get volumes between 67 and 80 gr H2O...not very far behind todays WSM case of roughly ~82 gr....again DEPENDING...

If you use the straight walled, max length '06 case(if you can find any) and depending on HOW/WHERE you place the shoulder and HOW MUCH you blow out the case, you can end up being even closer or exceeding a standard WSM case volume.

The 375 Hawk/Scovill runs 80 gr H20 and you can get some really impressive velo numbers if you do it right.

I use 4320 in my 338-06 because of the accuracy with 225 gr bullets and I started out with it...but CFE223 might be even better...QL shows almost a 200 fs gain over 4320 in the 375 Scovill compared to 4320 because of the better density/volume relationship...0.0646 for CFE and 0.0716 for 4320....and QL shows a similar velocity increase in the 338-06.

Definitely something to think about...were talking close to 375 Ruger/375 H&H factory numbers...in a '06 case WITHOUT going over 63-65KPSI.

Hummmmmmmmmm good

Here's another example of a what a modified '06 case can do...the 338 Gibbs...

70 grs. W760//26" barrel//210 TTSX//3005 fps//~4200 ft# ,muzzle energy//sub-MOA accuracy//easy bolt lift//firm primer pockets

Hard to believe but my chronograph is working great. Velocity checks on other cartridges are spot on.

Gibbs, ICL, Mashburn, Howell and I wonder how many other iterations on the 30-06 basic cylindrical case were developed and many lost to posterity.

I played with a case design program using the 2.645" basic case, stretching all the measurements and came up with one having an 86 gr+ H20 capacity...that's basically equal to the 338 WM, 375 Jamison and other WSM based 'cats and about 10 gr less than the 375 H&H.

MANY shooters have never even heard of these cartridges and they were all good ones in their day...it's nice to reminisce on days past.

You can spending $300-600 bucks on dies and reamers BEFORE you even begin to deal with barrels, stocks, bullets and brass when you start "'cat'n'" around...unless you can find a package deal in the used section.

Many of todays cartridges are already wildcatted by the factory so we don't have to and all the components are available at your favorite "let your fingers do the walking" online store.

Don't you just LOVE todays technology.

I assure you the Gibbs cartridges were loaded hotter than a pistol..I did a stint with the Gibbs but loaded correctly they added nada to a 30-06 IMP. case...Gibbs got some astonishing velocity, I could not approach him so gave it up as did many who tried them...

That is when I went to the 9.3x62 case for such wildcats..

In the end I went back to the 9.3x62, its still the best of the bunch..

quote:

I played with a case design program using the 2.645" basic case, stretching all the measurements and came up with one having an 86 gr+ H20 capacity

My 400 comes in at 87 grs of water when trimmed to 2.65 I leave the 375 that long as well. When you start dropping to smaller bullets unless you lengthen your mag you have to shorten the brass to hold the long smaller dia bullets.

I'll be happy to just get a 400 Whelan. Because push comes to shove, brass can be found almost anywhere.

quote:

I'll be happy to just get a 400 Whelan. Because push comes to shove, brass can be found almost anywhere.

If you don't mind seating those long bullets out to increase your OAL a basic Whelen will do pretty much what the wildcats will do.

In a 3.34" designed magazine 400gr bullets eat up a lot of case space.

If memory serves (often doesn't) comparing my shoulder forward improved 2.65" case with What Rip and the guys are getting from their long seated Whelens I think they are within 100fps of me.

Good 06 basic is getting hard to find.

quote:

Originally posted by Atkinson:
Scoville was the first to do a .375 on a 9.3x62 and he shortened the case as I recall?? and got some decent velocity and its been used quite a bit on Alaskan Brown Bear by several guides...

I am thinking the Hawk/Scoville is based on a blown out 30-06 case, correct?

I went back and re-read my Rifle Magazine article on the 375 Hawk/Scoville from 15 years ago. Bob Fulton, the original designer and owner of Hawk bullets, originally designed the 375 Hawk. His chamber specs are based on the 9.3x62 necked up, but he used 06' brass to form cartridges. Bob liked the loose chamber arrangement, and the bulged base diameters didn't bother him. However, Dave Scoville didn't like the loose chamber idea, so he reduced the chamber base diameter to 06' spec, and the 375 "Hawk/Scoville" was born (Seems like a flimsy way to get your name attached to a wildcat!) All subsequent Hawk cartridges use the 06' base diameter and 9.3x62 shoulder position/diameter.

I have to agree, the bulged base of the 06 when used in the 9.3x62 chamber sucks and can be dangerous and brass doesn't last long..but the simple solution is to use 9.3x62 brass..Back in those days 06 brass was available and 9.3x62 brass was hard to come by if at all...Today 9.3x62 brass is easily available, in fact today the metric is easier than much of our standard brass, thanks to Obama or greedy brass manufacturers depending who you talk to..Thank goodness for Privi Partisans (PPU)..and its damn good stuff at a very cheap price. AT any rate that's why I went with a 375 X 9.3x62..but the 375 Ruger is better yet.

Very cool old rifle! You will love it.

And that 416 Taylor on the Springfield... Love that one too.

The basic 30-06 case will do wonders properly
fire formed. The 375 -06 IMP is probably the easiest way to go followed by the 375 Hawk/Scovill.

In Alaska, the 375-06 IMP is most probably the best route with the 06 cases. Annealing necks is also recommended.
I have both a 338/06 and 35 Whelen. The 400 Whelen generally does not have the range or accuracy of the 375 -06 IMP.
Unless-the ONLY use of the 400 Whelen is for
bear hunting alone. Then it is a different story.

My answer to that will always be the 450 Alaskan
on a good Winchester Model 71.( I own 2 of these.) A lever action 1886 or Model 71 will be faster than any bolt action. Grizzlies and Browns generally require repeat shots, some need to be FAST repeat shots.

Ii quit trying after I had shot a number of buffalo and other large animals with both the 9.3x62 and the 375 H&H. decided no one could tell in difference it killing effect between the two..

To day I still shoot the same old 9.3x62 and and shot the 375 Ruger until age slowed me down and my hunting is a cow elk and deer so I sold the 375 Ruger. The 9,3x62 is my remaining big bore..and my smaller calibers are my go too guns.