The LFN will feed smooth as silk if the nose length is cut a tad under .45, and I reccomend a 280 gr for best all around use. 300 gr will stabilize and shoot very accurately, but needs about 1800 fps to do it, which is mild pressure wise, but recoil from the tiny gun takes all the fun out of it. A 280 gr stabilizes very well at speeds down to 1400 fps at least, which is excellent deer velocity if you want mild recoil. Best to get a .432 diameter and size that size so the chamber is filled up, to keep bullets straight on takeoff, even though the barrel is probably close to .429.