you must have things mixed up. the 35 whelen being a necked up 30-06 should be good medicine for anything in north america. should make an awesome moose cartridge. i had a model 70 338 win mag that had copper fouling problems. get some good cleaner and check over every screw and shoot no more than a couple rounds then clean it again. also try a couple different ammo brands. GOOD HUNTIN!