Eric,

What weight were you shooting, 20 or 25 gr? My sporter model seems to like the 20 gr. best. Also have you tried any kind of de-resonator on your sporter B-Mag? I put a Sims de-resonator on my rifle for the last few shots my last trip to the range and it seemed to help? I wasn't able to shoot enough (time and ammo), to give it a good test but hope to soon when I get another box of ammo. With the shortage of ammo I almost forgot how much fun these B-Mags are to shoot!!