Hello all,thanks for the replies.I usually shoot 150 gr. sierra HPBTM's in front of 50gr. Accurate XMR 4064 in my A3.The 180's are really a hunting bullet I know,but I have 400 of them and they shoot fine.I was going to use them for our clubs long range silohuette shoot,(those rams at 600 yards can be a real pain...)The recoil is more than the 150's but not unmanageable to me.I was just curious as to the accuracy potential of heavier bullets in a two groove ,if it was any different than in a 4 or 6,I know its more a function of the twist rate.Thanks for the help. Jim