Not sure who asked it now, but somebody wanted info on "American powders" load info. My rechambered Brno 602 (H&H --> WM) adores both IMR 4831 as well as H4831.

I haven't posted in a long while -- let's see if this takes, then I can give specifics.

BTNagel

Awright! Okay, with just about any 300 grain bullet, including RHINO, TBBC, Swift-A and Hornady : CCI 250 / Federal 215 primer, 88 grains IMR 4831, NORMA (or Weatherby brass) I get about 2650 f.p.s.
Aiming at the 2400 f.p.s. the locals advise, I can reduce to 2550 f.p.s. by using 88 grains H4831SC. I'm sticking with the amount of powder(s) to provide for a just compressed load with crimp at factory cannelure using Lee factory crimp die. (I have RCBS everything else.)

Hornadys shoot quite a bit higher than the others, but I don't have f.p.s. numbers there. Probably pressure is higher.

Accuracy is great with the 4831's; however, 235-grain Barnes-X loading with 90 grains powder is less accurate. Zero'd at 50 yards with 300 grain RHINO's, the 235-gr. are 6 to 7" high at 100, but 2-3" high at 200 and 2-3" low at 300 yards respectively. Looks like an option for long range shooting when I have the .375 in hand instead of the 7x64 Brenneke CZ-550, at least on larger bodied stuff. (Ducking now, but comments are welcome...)

The newly offered 350-gr. RHINO's etc. interest me in acheiving the 2400 f.p.s. thing in my .375 Weatherby Mag chambering. Although no published data exists yet, familiarity with this particular rifle and other loadings should give me a great starting point for loading the 350's.

380-gr. RHINO's with 72-grains IMR 4350 and CCI 250 primers (per Mauritz Coetzee, who is working with Kobus of RHINO Bullets) yields only 2200 f.p.s. in my Brno.

wthbymag,
I like that load with H4831 or H4831SC!

I used to use 88 grains of IMR-4350 with any 300 grain bullet. This would give about 2700 fps on a cool fall day in Alaska in my 24" barreled 375 Wby.

With my enlightened view of the world, I see the great value of your load of 88 grains of H4831/H4831SC with 300 grain bullets. I shall adopt it. Thanks.

If I ever try any bullets heavier than 300 grains in the 375 WbyMag, it will certainly be with one of the H4831's.

------------------
RAB

Weatherbymag,

Welcome to the forumn.

Are you sure about your velocity with 88 gr IMR 4831 and the 300 gr bullets???

I use 88-90 gr IMR-4831 in a 375 improved which has slightly more capacity than the weatherby and it gives me 2775-2825 fps in a 22 1/2 inch stainless barrel.

I use fire formed WW brass and Fd 215 primer.

Andy

Yep. Borrowed my dad-in-law's Chrony unit to check out data, mainly from A-Square's manual. I might get a little squidge more with GM215M's (Federal Match), but not another 100 f.p.s. Now, with the 300-gr. Hornady's, maybe speeds are faster -- still rising at 300 yards as I recall. Oh, A2 data references Dead Tough bullet in their brass to get 2730 f.p.s.

Waar is die koedoes?
(I have to wait until May 2003.)