6.5Express
Well-Known Member
I've lurked around here long enough combing these threads that are full of excellent information. My problem is this: I've been trying to work up loads in my 264 WM and cannot seem to get consistent results. I started with 140 gr vlds and couldn't get any powder to group well - everything was 1.5 - 2.0 moa. Tried 130 grain vlds and got the same results. Changed from CCI to WLRM primers and all three powders I was working with produced sub moa groups! Chose to work up with WIN 780 Supreme based on book velocity. Worked up to 67.0 grains with no pressure signs. 66.0 produced a .34" 3 shot 100 yd group. At this time, I ran out of new brass - I neck sized a few (with a neck-sizing die) and chambered to insure neck sized loads would function properly. Back out to the bench with the once fired neck sized loads - really sticky bolt and no group (1.5 - 2.0 moa). Went back through the lot of brass and full length sized all (these had all been full length sized, fired once, and neck sized) brass. Various powders (win 780 supreme, 7828ssc, H1000) all will shot terribly inconsistent .5" one time, 1.5" a half hour later. Also, now I'm getting pressure signs (sticky bolt, cratered primers) with 66.0 gr of 780 supreme (with full length sized brass)!
Why am I getting pressure signs with a load that was already worked up in the same rifle - same lot of powder, primers, bullets, and twice fired brass? Did sizing the brass twice (neck sized, then full length) without firing in between mis-shape the brass? All brass measurements are consistent with book dimensions. Tonight I re-checked all action bolts, base / ring screws, etc.
What say you?gun)
Why am I getting pressure signs with a load that was already worked up in the same rifle - same lot of powder, primers, bullets, and twice fired brass? Did sizing the brass twice (neck sized, then full length) without firing in between mis-shape the brass? All brass measurements are consistent with book dimensions. Tonight I re-checked all action bolts, base / ring screws, etc.
What say you?gun)