JeffWard Posted October 24, 2013 Share Posted October 24, 2013 inor I've been searching, but I'm sure somebody can point me to the best thread... I'm planning on building a 5" top-end for my M&P in 9mm Major: - I'm assuming I'll need a 5" barrel to comfortably make Major with the comp (I may be wrong). Will a 4.25" get there? - KKM Precision 9mm (1\/2 X 28) 5" barrel. - Carver 4-Port (Major) Comp. Looking for Power Factor Data, load data, bullet weights (assuming 124s), and powder options (since finding powders ain't easy...). There's lots of people shooting 9mm Minor from the M&P, but if I'm building one... I'm shooting Major. Thanks! JeffWard Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted October 24, 2013 Share Posted October 24, 2013 Jeff, you'll need to determine what is your gun's longest OAL - depends on the mags & chamber. I'm presuming (I no longer ass ume) that you have a fully supported barrel. If you can get OAL of 1.15" or even a bit longer, I'd go with the MG JHP 124 grains bullets and WAC - start around 6.5 gr (with 1.15" OAL - less powder if you go shorter) and work up slowly with a Chrono. Good luck. Link to comment Share on other sites More sharing options...
calvinc78 Posted October 25, 2013 Share Posted October 25, 2013 Contact DRobson on here he built one with a 4.25 and reamed the barrel to take a 1.170 and it made major with no problem. Link to comment Share on other sites More sharing options...
DRobson Posted October 25, 2013 Share Posted October 25, 2013 Major out of a 4.25" m&p was no problem at all with silhouette, TB, AA7, and N350. The m&p mags had no problems with MG JHP's loaded to 1.168 but I had to ream the KKM barrel. There was only about 2pf difference between my m&p 4.25 and my fullsize STI using the same loads. Link to comment Share on other sites More sharing options...
JeffWard Posted October 25, 2013 Author Share Posted October 25, 2013 Major out of a 4.25" m&p was no problem at all with silhouette, TB, AA7, and N350. The m&p mags had no problems with MG JHP's loaded to 1.168 but I had to ream the KKM barrel. There was only about 2pf difference between my m&p 4.25 and my fullsize STI using the same loads. I'm going to a 40-9mm KKM Conversion Barrel, and building on my current 40-Pro Limited Gun to start. I may still ream the KKM to keep pressures down, and load to 1.165. Saves me the cost of building on a new slide. My only concern is threading the comp off if I go back to Limited. How rock-solid do I have to mount the comp on the barrel? I'm going with a Carver 4 Chamber 9-Major Comp. JeffWard Link to comment Share on other sites More sharing options...
nheiny13 Posted October 26, 2013 Share Posted October 26, 2013 I made major in my 4.25 with hs6 and 124's no problem. Don't remember the amount of powder though Link to comment Share on other sites More sharing options...
A78729 Posted February 11, 2014 Share Posted February 11, 2014 One thing is making power factor which is easy. But I want to know of anyone that has a good load that runs the flattest possible. Link to comment Share on other sites More sharing options...
DRobson Posted February 12, 2014 Share Posted February 12, 2014 One thing is making power factor which is easy. But I want to know of anyone that has a good load that runs the flattest possible. 10gr AA7 with a MG124jhp @ 1.169 Link to comment Share on other sites More sharing options...
KungPfoo Posted March 1, 2014 Share Posted March 1, 2014 From my most recent load development. 124 MG CMJ, 1.18, Rem SPP 8.0 gr 3N38 - 164.6 PF 8.2 gr 3N38 - 165.8 PF 8.4 gr 3N38 - 168.6 PF 8.6 gr 3N38 - 169.0 PF 8.8 gr 3N38 - 173.5 PF 9.0 gr 3N38 - 174.9 PF 9.2 gr 3N38 - 177.9 PF 9.4 gr 3N38 - 181.2 PF For Ramshot Silhouette 7.0 Gr, 163 PF, 1315 Fps 7.2 Gr, 168 PF, 1355 Fps 7.4 Gr, 171 PF, 1378 Fps 7.6 Gr, 174 PF, 1404 Fps 7.8 Gr, 176 PF, 1420 Fps 8.0 Gr, 181 PF, 1459 Fps Between these two, the 3N38 is noticeably flatter shooting. For Reference I'm shooting a open M&P 9mm. 5" KKM barrel with the Carver 4 port comp Link to comment Share on other sites More sharing options...
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