Hello. Seeking advise from all 30cal crown owners. I have FX Crown MK2 .30cal, 600mm barrel, STX Superior 1:22 twist rate liner. Stock internals, no upgrades. I am only shooting slugs, don't care about pellets. Shooting 50 yards, tried NSA slugs, 45gn, 49gn, 55gn, 61gn, 65gn. Just want to say...