308 sub sonic

Hi, Am trying to develop a reasonably accurate (to 100-150 yards) sub sonic load for my 308. Before someone jumps in and says WHY??. The answer is "because I can" ( and I like the thought of a silent 308 round around the barns) So, trying small quantities of fast pistol powders with 150gn RN bullets as used in the good old USofA. All going well, nic(ish) groups, whisper quiet(with a Mod) at 1040 ish fps, till I looked at some spent cases. Picture below. Does that look like over pr

Some info I sent some friends from the local rifle club about making low-velocity ammo now that the import of IMR's Trail Boss is banned due to the European REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) regulation coming into force. I'm starting to use Vihtavuori's N32C 'Tin Star' as a substitute for Trail Boss. The bulk (load) density of Trail Boss in a 100% filled case, non-compacted/compressed, is 0.310 g/cm3 (grams per centimetre cubed). Tin Star is a