I've found that CCI Blazer gives the best 50yd groups from both my Marlins, 880SQ and 7000T. It surprisingly beats several kinds of standard velocity ammo including CCI Green tag and three flavors of cheaper Eley ammo.
I agree,.. The CCI Blazer gave me tighter group averages when I compared them to CCI SV. But then again, this is out of a semi-auto non match reamed carbine ruger 1022