42 91/30 and m38
Both my 91/30 and m38 will put the holes inside an inch at 100 yds, since I scoped the 91/30 it is capable (although I am only capable on certain days) of putting them in a ragged hole, but only with max-handloaded sierra 180gr sp which measure .312-.3125". Both rifles are Ishvek and measure .312 grooves.
I should mention all other ammo is, as put earlier, minute-of-pie plate. Oh, and the reason Polish patterns instead of grouping? It measures .308 bullet diameter...