Re: Brass 7mm rm
I have 20 pc. of R-P 7mm RM that was factory ammo; probably 10 or more years old before I bought it. Those cases now have 11 firings on them. There is no sign of the case wall thinning; I check each case after each firing with a RCBS Casemaster and log the results. I intend to reload these until the first sign of wear and tear, stretch, cracks, splits ect. to see how far they will go.
The first couple of loads were mixed charges while working up the load for the rifle. That turned out to be 72.4gn of Retumbo under a Berger 168VLD with a CCI250 primer. They are neck sized give .0015" neck tension and the shoulder is bumped .015" for each loading.
I also have some Hornady brass that is prepped identically and shows no sign of any impending issues. This brass has only 3 or 4 firings on it.
None of the brass has been annealed after it left the factory.
On the other hand I have some 30-06 I load for my M1 Garand. I don't recall the load but it was the middle of the range for H4895 in the Hornady #7 Manual for a 147 FMJ. The last batch of R-P started to split the necks after 3 firings.
Without measuring anything, I'll bet the difference is the quality and specs of the chambers. The 7mm is from Hart where as the Garand is a mid to late 50's SA military barrel.
Be easy on the brass and it will last longer.
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Last edited by Wile E Coyote; 04-23-2012 at 01:01 PM.
Reason: spelling + addition