What cases can .375 Flanged be formed from?

Looking to find out from what cases can one form .375 Flanged brass, I see RCBS makes a limited production case forming die, and I'd like to figure out how to form "practice brass". I don't own a gun in the cartridge yet, but I'm looking at either the .375 Flanged or the .450-400. Brass availability of the .450-400's pushing me that way, though I do believe I prefer the .375 Flanged (I already shoot .375 H&H, and cast for it, have the bullets on hand, etc). If there's an angle to form the brass, the decision's likely made. Thanks in advance for any info.

According to my Handloaders Manual of Cartridge Conversions, the only brass listed is (BELL) .375 Flanged. Goes on to say; trim to length, chamfer, F/L size and square case mouth, so assume brass is near ready as purchased. I would think some serious searching the net would come up with some brass to make the project doable. Good luck!

Scott

Just took a look at Gunbroker.com and saw loaded ammo and brass available for what seemed reasonable prices. Worth a look!

Scott

Why not just buy the proper brass and not worry about forming it from something else?

Jamison
.375 Flanged Magnum

Or Bertram

http://www.buffaloarms.com/browse.cfm/4,191.html

I'm not a fan of Bertram brass, Jamison is good and I'll use it as my primary hunting brass. However, no interest in burning Jamison brass just to punch paper, and the aforementioned RCBS case forming die shows there must be a readily available case from which they can be formed. That is what I'm trying to find out, cheers,

Angus

After doing a quick look I'd say that if you really "need" to form it rather than buy some, you should be able to form it from 45 basic or 45-120 brass. But the time and cost would far out weight the benefits IMO. The rim would need to be trimmed down and the base drawn down then several steps of forming the neck and fireforming the shoulder.

I've used both the kanagroo and Jamison and both have had problems. The Jamison brass has been better in the last couple of years though. The Ozzie stuff just needed the flash holes cleaned up on my 577/500 3 1/8".

They've been shot about 7X each w/o problems. Some of my 450 NE Jamison Brass has been shot 10X w/o problems also. But for the 450 I prefer Hornady's! (cheaper and just as good as Jamisons)

Mike, sorry it's taken me so long to say thanks, but appreciate the info.