I would agree with John Taylor on pressure limitations, but I don't believe it need be quite as limited as. The old guns shot better at 200 and 300 yards on the old Army A target than we could. 30-30 data in the 7mm with 170-175-grain bullets, and never got into any trouble. On guns we had chamber necks were waaaaay loose and we never reamed case necks, but your mileage may vary. We had best luck cutting off '06 brass and setting up the die so that rounds chambered just a bit snug, then when setting up to reload we pinched a 0.010 shim between the shell holder and die body at the top of the stroke to avoid setting the shoulder back. Headspace on all the ones we tried was about 0.010 to 0.020 way too loose and you would get head separations unless you left enough of the 8mm neck as a false shoulder for crush-up to headspace. Some of the ammo went bang, and what didn't we pulled the bullets and salvaged the powder and formed new brass from. and Remington-UMC FMJ ammo with cracked necks which we got cheap. I had one of these as a kid back in the 1960s, and we had buckets of old US Ctg.
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