The Hdy 300gr xtp MAG (be sure it is the MAG designation) shoots like a match bullet in my FA .454 revolver---I tried many others cast and jacketed----this one seems very forgiving on hot and softball loads and cost is competetive with hardcast lead gas check bullets----gotta be tough bullets or they will come apart at high .454 pressures or lead up and shoot patterns rather than groups----you may find the Encore barrel a little different than a Freedom Arms barrel and there is no forcing cone issue, but high pressure is high pressure. ------ pg