I cant decide between the two. The aac has the 1/10 & the sps has the 1/12 twist. What would be the heaviest bullet you could run in the 1/12? On that same note what would be the lightest bullet I could run out of the 1/10. I was thinking of trying the 155gr to 175gr ,along with some 150gr. I plan on getting a new stock for it ,along with a trigger as I get the money. rang will be mostly 100 to 300 . With an occasional 600 to 1000 once a year ,maybe twice.