Sig MPX PCC FTF

[Fasthenk65]

Pfff as for reliability I don't know. FTF with 124 gn hollow points PF 132, FTF with 147gn RN with slower powder PF 133. Loaded longer, shorter tried everything. Cleaned all several times then 50 rounds go ok, then FTF's... Maybe load even hotter???

 

Factory 115 gns PF 150 no problem...

[Chillywig]

Failure to fire? Like the 9mm round is in the chamber in battery and doesn't go bang?

 

I have 2 MPXs. Both took a couple hundred rounds to get broken in. Your power factory might be a bit low for a brand new gun with mags fully loaded. Factory 115 FMJ type ammo will be closer to 150PF out of your rifle.

 

My 147gr load runs 138PF in my carbine. Same load is 129PF out of a hand gun

[Fasthenk65]

failure to Feed

[mannyc]

You need to go hotter, I have the same issue, my mpx pcc, it would not run reliable with the 147grn , 130PF load. Getting FTF,FTE. Bump it up to about 145-147PF(factory load,1000fps when shot thru a pistol) and it works great.

[Bwillis]

A buddy shoots a gen 1 or 2 mpx at 135pf 

 

4.3 n320 @ 1.130 with 124 precision delta jhp 

[Chillywig]

5 hours ago, Fasthenk65 said:

failure to Feed

 

Will your load lock the bolt back reliably on an empty mag? If not your PF is too low for your MPX

[Fasthenk65]

5 hours ago, Chillywig said:

 

Will your load lock the bolt back reliably on an empty mag? If not your PF is too low for your MPX

yes it does...

[v1911]

I ran about 500 rounds of WWB and just lubed mine until I was ready to start with handloads. Cleaned it up good and now eats a steady diet of 124 JHP and 147 JHP with zero issues. Out of a pistol, they're 130pf. Never chrono’d out of the MPX.   

[inertia]

I posted in your other thread load for function not power factor, its gas operated gun, use more powder by lightening the bullet and or slowing the powder and it will run. My new pcc is much less picky than my gen 2. When I stopped trying to use pistol loads and developed loads just for the mpx all of my problems dissapeared.

[Rolex]

I use N320 or SP at 4.0 gr. PD 125 JHP at 1.135 oal and have had NO issues

with my MPX Competition Carbine. 

[Acer2428]

Gen 1 has a larger gas port and will run at a lower PF/faster powder.

 

Gen 2's (most of what's out there) can't skirt the PF floor, especially with fast-ish powders without modification. 

[George16]

I had great luck with both my gen 2 and PCC model MPXs using either 4.0-4.1 Gr sport pistol and win231 @ 1.125-1.130 OAL. Bullets used were either 124 Gr PD or RMR JHP (loaded this to 1.102-1.104). 
 

The only time I had a fail to extract was due to the failure of the extractor.