What COL are you using. I was shocked the effect of COL on these TSX's. I loaded some for my PSS 300RUM with 88, 89, and 90gr of RL25. Out of those three loads, I found 88gr the best to work with. So I then loaded 3.58", 3.60, and 3.625" COL. I found the 3.625 gave the best accuracy with 1.1" or so groups at 200 yards. If I wanted to reach my lands and grooves on this chamber I would have to load to 3.88" which ain't going to happen.