Yes I have used a lot of them out of several different ARs, a Mini 14, Stevens 200, Rem 788, and a H&R Handi. All the ARs and the Stevens have a 9" twist and the bullets work fine for me. They give good+ accuracy and kill the snot out of coyotes. I had one runner that got away; I couldn't tell for sure if it was hit. It was in the woods and may have got some splash from disintegration on a twig or something?
I have been wanting to try the 55g TNTs just to see if they are any better but Obanomics has kept me from doing a changeover so far. I have no complaints about the 50g version and it works fine out of my 1:9 rifles. TTT