I have a .50 cal Knight LRH and I've been shooting 110 gr 3f T7 weighed charge and a 250 gr Blastic extrean bullet. This combination has worked great for me with 1 ragged hole groups at 100 yards. Thay are great rifles and extreamly accurate. As far as barrel length I can't reallysay as I havent cronoghaphed mine yet,but I don't believe an inch difference would be that big of a difference. I owned a CVA prior to my Knight and there is no comparison. You've made a great choise --Good Luck