I am unsure what you mean by your rifle couldn't shoot because the barrel twist was too slow (i.e., 1:11") or would not group. The 200g Terminal Ascent bullets require a minimum 1:10" twist to stabilize—so, 1:9" is fine will your SG.I'd like to use that 200 grain terminal ascent! I had a rifle that couldn't shoot that at all and I have 10 boxes of it now. It's a bullet with solid construction and a pretty good bc
I was too late in the game to acquire the TA bullets. If 1:9" does not work, I can help you get rid of them.