Also a super 91 owner, my experience is limited to about 100 rounds.Both white ss 480 g. and no excuses 460 g. proved to be too loose with the clean barrel that I prefer to shoot. Using a one layer wrap of white teflon tape on both bullets produced a good slip fit and groups under 2 inches at 100 yds. with t73f loads of 75-90g. RWS #11 caps were used without a wad. Also bullshop 460g. .504 fit well on a clean barrel without the teflon wrap,but have not been fired and there seems to be some question if they will be available in the future. steve