Using win 231 powder and 115 gr fmj bullets, I loaded my first loads last night. My three loads were identical except for powder weight, where first i did 3.5, then 3.8, then 4.1 while max is 4.5. So i took it out today. 3.5's didn't even open the slide. Neither did 3.8, and 4.1 did usually but the shell got hung in the slide every time. So my question is, why? I'm afraid to use the max load. I'm shooting a 9mm s&w sigma. My oal is 1.13. So i'm thinking, do I need to increase my powder charge? Or should i shorten my OAL to increase pressures since w231 is a rather low volume powder? Thanks guys.