My best groupings (I count an excellent grouping as a ragged hole at 40 yards for PCP and 25-30 yards for springer)

HW100K .177
Best: Weihrauch Magnums @ 10.2 grains (no idea head size)
Good: Weihrauch Select @ 8.4 grains (no idea head size)

HW95 .22
Best: H&N FTT @ 5.52
Very Good: AA Field @ 5.52

Rapid Mk2 FAC (32ft/lbs) .22
Best: Bisley Magnums (no idea head size)
Very Good: Weihrauch Magnums (no idea head size)
Truly, Terribly Awful: AA Field @ 5.52