I shoot this 310grs in my hunter RH and Marlin 1894 44mag and shoots great . I shoot them to .431 in both. It shoot better. at first I did .430 and the Marlin did not shoot groups tight like I was hoping , then I went with .431 and it close up the groups and works good in the RH too , but you know it when you shoot it in the RH . The RH is 7 1/2" barrel.