MPX 9mm Load

[Faded]

I am struggling getting a 9mm load to cycle on my MPX Carbine. All the loads cycle and work on my pistols, but on the MPX it is failing to eject and stove piping. I tried 6 loads and here is what happened.

124g Berrys FMJ-RN; misc brass; 1.135"
4.2g W231 wouldn't cycle
4.3g W231 ran a full 10 rounds no issues
4.4g W231 FTE stove piping
4.5g W231 FTE stove piping

4.3g Bullseye FTE stove piping
4.4g Bullseye FTE stove piping

Why does it stove pipe with a hotter load? Thoughts?

[CAL.BAR]

Shouldn't have to. Mine runs flawlessly on 4.4 W231.

[Faded]

I thought stovepiping is from light loads. What causes it?

[MontClaire]

For God sakes use 115gr bullets in this gun!

[Spyder]

Mine w/ 8" barrel runs great with 4.3gr Red Dot or 3.4gr BE and 115 grain plated or FMJ pull downs.

[davek8s]

I thought stovepiping is from light loads. What causes it?

Ive found that lack of lubrication or stiff springs causes stove pipes.

I had stove pipping issues with a hand gun awhile ago, someone on Calguns suggested I leave the slide locked back for a few days to soften the spring. I left it locked back for a week.

I don't know if that's an old wives tale, but I do know that it worked and my pistol stopped stove pipping.

You could try leaving your bolt locked back in between range trips and see if that helps.

[Faded]

For God sakes use 115gr bullets in this gun!

HAHA i was just looking at the W231 load data and was thinking I could drop to 115g and try those cause they can go hotter.

[davek8s]

Have you tired factory ammo?

[Faded]

Have you tired factory ammo?

Yes factory Winchester 115g cycle fine.

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[stilly]

I am struggling getting a 9mm load to cycle on my MPX Carbine. All the loads cycle and work on my pistols, but on the MPX it is failing to eject and stove piping. I tried 6 loads and here is what happened.

124g Berrys FMJ-RN; misc brass; 1.135"
4.2g W231 wouldn't cycle
4.3g W231 ran a full 10 rounds no issues
4.4g W231 FTE stove piping
4.5g W231 FTE stove piping

4.3g Bullseye FTE stove piping
4.4g Bullseye FTE stove piping

Why does it stove pipe with a hotter load? Thoughts?

Well no wonder... Might as well be using RED DOT. (shame on me!)

Try CFE Pistol, Power Pistol, or HS-6. I bet one if not all of those would be great.

They function great in my rarely fired 92FSc.

Aside from all of that though, how do you like the MPX?

I was going to get one but they did not start sellign them until after SSE so I figured I would go with a carbine, but then with all of the BS they pulled with the P320 I have harbored some seriously bitter hatred towards Sig lately. I am thinking maybe just time to go and get a Turner MP5... Sig can have a bowl of hmm. SPUNK! and there ya have it.

[Spyder]

Stilly, what's wrong with red dot?

[Faded]

Well no wonder... Might as well be using RED DOT. (shame on me!)

Try CFE Pistol, Power Pistol, or HS-6. I bet one if not all of those would be great.

They function great in my rarely fired 92FSc.

Aside from all of that though, how do you like the MPX?

I was going to get one but they did not start sellign them until after SSE so I figured I would go with a carbine, but then with all of the BS they pulled with the P320 I have harbored some seriously bitter hatred towards Sig lately. I am thinking maybe just time to go and get a Turner MP5... Sig can have a bowl of hmm. SPUNK! and there ya have it.

I think I have CFE Pistol laying around I can try. I use W231 for my 9, 40, 45 loads so was hoping to just have one load of 9 that would run on all the 9's. I bought bullseye during one of the panics so I have like 10 pounds that I don't use.

The Mpx is sweet. Mike @EBRWorks made this one. I haven't had many rounds down range cause I don't have a load dialed in, but from the screwing around I've done it's been fun.



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[stilly]

I think I have CFE Pistol laying around I can try. I use W231 for my 9, 40, 45 loads so was hoping to just have one load of 9 that would run on all the 9's. I bought bullseye during one of the panics so I have like 10 pounds that I don't use.

The Mpx is sweet. Mike @EBRWorks made this one. I haven't had many rounds down range cause I don't have a load dialed in, but from the screwing around I've done it's been fun.



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That is nice but what happened to their crazy looking sliced barrel compensator that was like 10" long? That does look kind of nice though too, until you pull the trigger and see it is a fake can. I would have opted for a totally different MB that clearly is similar to their other style. Just well, just because... When I am done with my .44 mag doomstick I will maybe look to get a little burper wannabe and see what fun I can have in the garage.


Oh nevermind. THAT is what happened...

****ing SIG... I swear they are idiots. They may let a nice thing slip out once in a while but they are freaking idiots the rest of the time...

CFE pistol, Power Pistol and HS-6 gave the most push back in my recent 9mm reloads. Power Pistol might have also been in there. But IIRC, Bullseye is rather low on the velocity in comparison to the others I mentioned. Who knows, maybe you need to go higher in BE to make it work, or just switch to a different powder.


What is wrong with Red Dot, Spyder? Absolutely nothing. But I dunno if I care to keep testing it with a 105gr SWC in my 9mm... Oh and CERTAINLY it aint gonna hurt much in a .44 mag, or even a .44 SPL loaded in a .44 mag body...

[Faded]

Just picked up 2# of hs6 to try and some 115g bullets as well. I'll try the 124g and 115g with hs6 and see how they do.

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[357magnum]

Yes factory Winchester 115g cycle fine.

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115gr is your answer.
I load 5.0gr of Win 231 with a 115gr FMJ, has worked in every 9mm gun I have fired in the past 25+ years.