In my conversation with Savage's CSR about what groups could be expected from B-Mags their answer was 1.5" at 100 yards. The replacement Sporter model rifle they sent me appears to do that. The target that Savage sent with it was a 3 shot, 1.03" group which I assumed was at 100 yds. I haven't had enough ammo and time to really test the replacement out but I have shot a few 3 shot groups better than 1.5" at 100 Yards with both 20 and 25 gr ammo with the 20 gr grouping the best. After reading a couple reviews where people improved their rifle's grouping by adding the Sims barrel de-resonator (on sale now at Cabelas for $10) I put one on my skinny B Mag and shot one 5 shot group at just over 1" with 20 gr ammo at 100 yards.

Fla9-40, I'm not sure if any of this helps but according to what Savage told me groups of 1.5" or tighter at 100 yards should be expected.