Just a question, are you shooting any of these suppressed? Because whenever I shoot any loads much lighter than the ones you posted, I get some pressure signs early on. I use LC and IMI 7.62 match brass. I have a batch of LC-LR but never wanted to waste it on a gas gun. When I shoot those same loads suppressed, I cannot use the brass again. ( I get flat primers, expanded case heads, and primer pockets are blown out after one firing) I shoot an LMT MWS with 18" SS barrel. It's a precise gun, sub MOA with lighter loads, but I'm getting flat primers at 4 grains below what most are shooting. I've used Varget, XBR, and 4064. Now, I've never seen ejector swipes, but the loosening primer pockets especially suppressed is what's worrying me. (I've also use the 16" CL barrel and I have the dual-ejector bolt and same symptoms) Looks like my chamber is cut fairly loose. Should I up the load somewhat and maybe get better sealing? Also, this rifle is overgassed so that may be why it beats up my brass.
Thanks,
I run a home built 308 Win gas gun and had similar issues with pressure. I used 175gr SMK and with Varget couldn't go over 42 grains, IMR 4064 gave me pressure signs at 42.6gr, and H4895 ran into pressure at 41.5gr.
I ended up settling on 43gr of Reloader 15 which gets me 2,700 fps with the 175gr SMK and no pressure signs. It's also a super accurate load that has been sub-moa out to 600 yards.