The 124 grain Berry's HP are good shooting bullets. In a handgun they will shoot more accurately than the person shooting in most cases. The same load can be used in the handgun, and carbine provided both feed, and cycle. I usualy seat on the longer side for reliability.
Any primer, with a charge of 4.0 to 4.2 grains of TiteGroup, or Bull's Eye give me good results with those bullets.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.