Try the Federal heavyweight #7 shot ....you wont get those kind of #s but the killing power compared to ANY other commercially loaded shell is UNEQUALED !!!!! Both of those are good patterns though. Just FYI...I have the same gun but in 24"bbl. and a Roberts Final Strut .650 shootin the Hevi 7s and got 336 in a 10" circle. Try chokin' it down a lil more.