Between myself and friends, we have three T-3s in 6.5x55( 1 sporter, 1 Varmint, 1 Supervarmint), and all three rifles shoot 129-142gr bullets sub 1/2 moa for five shots, using R-22 in Lapua cases with Fed 210 primers. We are producing around 2750fps with 142 grain bullets, and closer to 2850fps using 129-130 grain bullets. The 129 and 130gr bullets are Accubonds, and the 142s are Matchkings. We use a COL of 3.10" for all three bullets, and powder charges from 47gr to 50gr depending on the bullet.