357 H&H to 375 Weatherby fire forming - Brass options?

[tokguy]

I'm looking at factory Rem 375 H & H and fireformed and reloaded 375 H & H ( now 375 Weatherby ) and the differences seem rather minuscule to me.
While quality brass is better, the fireforming cannot stress it much IMO.
The velocity claims I do not disregard, but the difference is very small to my eye

 

[dan belisle]

Fill a 375 H&H with water and weigh it. Do the same with a 375 Wby case. It's the increase in capacity that counts. - dan

 

[tokguy]

Point well put. Not likely that I'll have time for such an activity in the next while.
But looking at them I can get my head around the ability to use 375 H & H in a Weatherby though, very similar before and after
Not unlike the difference between a 244 / 6mm and a 243 win or 303 Savage & 30-30 Win. A tad but not to see much visually

 

[dan belisle]

Longer from base to shoulder , shoulder itself pushed out to straighten the case. I think they look dramatically different, though I think that difference doesn't transfer into a huge gain in velocity. I think the fact that the original is slightly underloaded to accommodate some over one hundred year old guns, and the Wby's have freebores of various lengths (it's changed over the years) have almost as much to do with the increase as the case capacity increase. - dan

 

[Dogleg]

Visually the difference isn't huge, but the H&H case is one of the few that really benefit from "improving". Here's my little herd of .375's, a H&H, 'Bee and Chey-Tac. Muzzle energies with my loads are 4200, 5200 and 7700 foot-pounds. Or to put it another way, the Chey-Tac delivers the same energy at 500 yards as the Weatherby does at the muzzle and takes the H&H's muzzle energy level out too 800 yards. It does benefit somewhat favorably from high BC bullets, but it is what it is.

 

[nw mb]

I have a 375 Wby that's never seen a factory round. I use hard cast bullets from Bullet Barn to fire form. Sized to .376 or .377 perfect for forming brass. Cast 375's are a viable hunting option too. BB offers a 265 gr gas check bullet sized .376. Lyman load manuals have load data.