Good afternoon, I'm having a Huben K1 moded to .177. with a TJ 1in 22 twist. I'm assuming it will have boat loads of power to push heavier pellets. What about the 15+gr range. I've gathered H&N Sniper Magnum at 14.97gr, H&N Rabbit Magnum 11 at 15.74gr and JSB Beast at 16.2gr. What about the H&N Pilerdriver at 21gr? Any feed back and suggestions would be appreciated.