I was hoping to do the same with 150 gr SSTs and 150 gr GMXs with a 308. Problem is the SSTs group well, but I can't get the GMXs to group at all in that rifle. Tried the GMXs in a 30-06 and got great groups with the first set of test loads. Now if I can get the SSTs to group in the 30-06, I will be set.
