I've been using the 65 GKs in ARs and a 1 in 9" CZ bolt action .223. Very accurate in everything using 24 / H4895. Almost as good with 24 / TAC. I enjoy trying different bullets and that's the only reason I've been working with the Nosler 64. I've also tried the Nosler 60 Partition and the Winchester 64 in the CZ. Initial results haven't been good, particularly with the Winchester bullet.