the b26 in .177 after over 2000 shots: gamo hunter 900, jsb 8.4 870, cp 7.9 880. the b26 in .22 broken in with hobbies 11.9 758, with crosman premieres 14.3 735, daisy wadcutters (best groups) 14.3 740.
the b40 after 4000+ shots averages 940 with cphp 7.9. I dont remember the others, since it puts these in a ragged hole at 35+ yards. The b40 in .22 shoots 720 with crosman premieres 14.3. All these numbers are close to the 50 shot strings average shot with every rifle.
Best of all 4 as a all around rifle: B40 .22