Load data needed for mpx and jp5

[jeremy kemlo]

I’m trying to work up a reliable USPSA load for my daughters recently acquired sig mpx 16” barrel gen 2 and  my dad’s recently acquired  JP5 steel challenge version 14 1/2 inch barrel with comp and 70 locker. 
 

I’m trying to keep things simple and use what I have unless someone would recommend a different bullet or powder that would be significantly better.

I have Everglade 115 full metal jacket bullets and Bayou Bullets 145 grain coated bullets. powder is n230. 
 

Anyone have a favorite load for either gun using 115 or 145 and n320?  
Thank

[MCW]

I have used 4.5gn of N320 with 115gn bullets. It has a PF of 128 in my JP5. It is a flat shooting load. 

[Salsantini]

I use 115 FMJ from RMR in my MPX.  4.0 gr of AA2.  1.10 OL.  Soft shooting and reliable.  Most of the poly coated bullets I've tried need to have a really short OL.  The profile is fatter at the tip of the bullet and sticks in the lands of the MPX.  If you have N320 I would start at 3.9gr.  4.5 gr is a max load for N320.   Use the 115 gr Everglade and keep the OL to 1.10.  

[philmadxx]

The 70 degree locker should be fine with most everything as long as don’t want to shoot really soft rounds, like some syntec rounds. An 80 degree shoots everything.

I use 3.9 gr N320 with 124 RMR RN bullets set at 1.118. PF about 125. Accurate, flat, reliable.

Good luck.

[Bdh821]

4.5gr Alliant Sport Pistol under a 115 @ 1.130” is what I run in MPX and JP5

[miller9128]

I just started reloading about the same time I picked up my SIg MPX, 16" barrel for USPSA. I am using 147 Berry RN, 3.8 CFE Pistol, 1.136 OAL. I have had a couple jams and sometimes the trigger seems to lock for 1/2 second. TOday was the first time I had a double feed. THe RO told me today it appeared gases and sparks where coming out the port. I'm looking for any suggestions.