Bought some Aguila SSS 60gr @ 900fps ammo for 22LR for, shall we say, urban varmint shooting (large varmints) BUT the 60gr bullet will not stabilize in normal 1 in 16 twist 22lr barrels. Need more power for these varmints than is gained from CB Long or any pellet rifle options. Possible solution? My new DPMS AR has a 1 in 9 twist rate and should shoot shoot these great. Anyone know where to buy a decent cartridge adapter that will allow me to shoot these in my rifle with its stock barrel and bolt assembly?