I am searching for an accurate recipe for my M&P. Any help would be appriecated. So far I have tried 115 berrys over 4.7 Win 231 win primers. The M&P hates it!!! My glock 34 loves it!! I have also tried 115 berrys over 5.0 universial handgun. The M&P hates it!! I also have tried 124 berrys over 4.2 universal handgun. The m&p hates it!! I normally carry 115 to 124 grain and try to load close to factory specs. I shoot IDPA so I like to keep everything a little hot to make sure it will run and also to meet powerfactor. I can switch over to factory ammo and the M&P shoots tight groups. I also know it is not my reloads, because my Glocks don't have any problems with them. Thanks in advance for any advice!!