I am currently running the 700mm barrel on my FX Crown in .30 caliber. Shooting a JSB 44.75 grain pellet I’m getting 900 FPS and awesome accuracy. Has anyone experimented with the 380 mm barrel in the .30? How much velocity will I lose? Any accuracy difference at 50 yards? I shoot the 380 mm barrel in my .25 and the accuracy is one hole at 50. Thanks!!