Re: 300 RUM Bullet Crimping
Thanks for the replies. All the factory ammo by any manufacture I've bought has had a visible crimp, no cannelure. I do agree with Lefty 7mm, and it is probably a manufacturing guideline to crimp bullets of magnum rounds. I'll also be loading .45 acp, and .44 mag, so bullet crimping may be needed in those cases.
I spent time last night reading post's on 300 RUM, and apparently there have been problems with chamber dimensions associated (chambers too tight), and FL resizing not bringing case dimensions back to tolerance with the overly tight chambers. First loadings, and factory loadings fine but extraction, and pressure problems on each successive loading.
I've not gotten this gun back from the gun builder yet, but would expect to by the end of this month.
Any suggestion on case trimmers? I have an RCBS Trim Pro, and have been trimming new cases down .001 over specified trim to length .44 mag, 45 acp. The Trim Pro does not seem to be cutting very square even with pilot, and have had to adjust constantly to get consistent trim lengths. I wondered if the rough adjustment screw was just not holding as I was having to adjust after each case. In any event, with my brilliance in solving these type things I had the bright idea to put a split shot in each screw hole in hopes that it would grip a little better, and good luck ever getting the lead out of theadjustment screw holes without channelocks, and maybe damaging the threads. Thought about a little heat to loosen the lead up, but will probable do some thread damage in the process. I think in the end you get what you pay for. I'm considering the Wilson trimmer with cartridge specific case holders. Does anyone know if these case holders work equally well with new brass, as firedbrass? Is the Wilson worth the money?
Sorry so long a post
Last edited by cserwin; 06-19-2012 at 07:34 PM.
Reason: incorrect info