For the most part cast bullets at high speed stink, unless gas checked. I use Hornady bulk packed 124 grain FP FMJ's for plinking and 124 Grain XTP's pushed by Hodgdon Longshot powder. TO me in my 239, it actually shoots better when velocity is near max. I can't explain that. Recoil is not bad either. Just my opinion, not intended to step on any toes.
Another major issue is to make sure with the short neck that sufficient crimping exists to not allow the bullet to be pushed into the case upon hitting the feed ramp. Using Dillon dies with the profile type crimp here is the method I have worked out.
First find the proper OAL. Then feed the round into the gun from the magazine. Measure the OAL, if it has changed add crimp in small increments. When you can cycle a round thru the gun 5 times with no shortening , you have it right.
Another thing is the cases should be lubed due to being bottlenecked.
All in all it can be much more trouble than the 40 S&W, but to me it is acceptable becauseyou will never have a feeding problem if all is loaded right because of the shape of the round.
Happy Shootin'
GregH
