Well well. Got to shoot at 200 and 400 yards today with the LR-308 in-between wind gusts. Same basic loads as before, 35, 35.5, and 36 grains of RX7 with the powder-coated 30 Sil bullets from air-cooled wheelweights diluted with 10% soft lead and 1.5%tin added for 14 bhn aged.
The range:
Groups at 200 yards, first one was three aiming at the top bull, then I aimed at the top of the paper and got the second group, then changed the top target for a different one with a 2" pastie for aiming and shot the lowest group.
Being pretty dang happy with that, I set up a plate at 400 yards (it was already there and I didn't feel like packing it back to 300), estimated the drop and shot one low into the rocka at the bottom. After aiming a foot higher I put the next four into 11.5":
Not quite as good as Waco's long range shooting, but I got an 18" semi-auto with a plastic receiver and a buttstock that is about as unfriendly as it gets for riding bags.