Update: Sig P365 XL disappointed

[CarJunkieLS1]

So today I took your guys suggestions and tried different ammo after another thorough clean and lube. Results were much much better but still not 100%. 24 round of 115gr WWB had 1 fail to feed. 24 rounds of GECO 115gr had 1 fail to return to battery. 24 rounds of American Eagle 124gr was 100% function.

Two failures from 72 rounds is WAY better than the 7 or 8 failures per mag I had before. I'll clean it again and shoot it another 150 rounds or so before I'll contact Sig. If after a total of 275 rounds if the pistol isn't 100% then back to Sig it will go.

 

[Zaydok Allen]

Improvement is good.
Talked to a guy yesterday who had one. He said his didn’t run 100% until he had 400-500 rounds through it.

Been perfect ever since according to him. His wife took it away.

 

[Ks5shooter]

Polish the feedramp? I don't own a 365 but made my auto pistols run reliably.

 

[CarJunkieLS1]

If it takes Sig polishing the feed ramp to make the gun work that's fine, but I will not do anything to the pistol other than clean and shoot it. No way I'm gonna risk voiding that warranty

 

[Ks5shooter]

^^^^This is true I didn't think of that.

 

[tomrkba]

The gun is broken. Call SIG and get them to make it right. They will get it working.

 

[9mmepiphany]

...24 rounds of American Eagle 124gr was 100% function.

I'm pretty sure a few people mentioned, in the other thread, that it should be broken in with standard weight bullets

 

[94045]

I have seen several recommendations of breaking them in with 124 gr.

I broke mine in with S&B 124 NATO for the most part so I don't know how it would have responded to low pressure 115 gr.

Since break-in it will start malfunctioning after about 350-400 rounds of WWB until cleaned. It runs fine on Remington, Speer and Federal 115 FMJ.

 

[Spats McGee]

OP, I'm sorry to hear about the problems. Hope you get it resolved.

.... 24 rounds of American Eagle 124gr was 100% function....

I'm pretty sure a few people mentioned, in the other thread, that it should be broken in with standard weight bullets

I thought 124 grain was a standard weight in 9mm. Or have I misunderstood your post?

 

[JTQ]

OP, I'm sorry to hear about the problems. Hope you get it resolved.


I thought 124 grain was a standard weight in 9mm. Or have I misunderstood your post?

Yes, 124gr is the standard weight. The point was the OP experienced 100% function with 124gr ammo.

The OP had problems with 115gr ammo in the other thread, and this one too, and was hesitant to believe a simple switch to 124gr ammo would fix his problem.

 

[Hartkopf]

I see lots of 124gr factory ammo that has less ME than 115gr. Seems like 320 to 330 ME is common for 124gr and the 115gr that I commonly use is Winchester white box with a ME of 360. If Sigs are over sprung wouldn't higher ME be the way to go regardless of bullet weight?

 

[CarJunkieLS1]

Yes, 124gr is the standard weight. The point was the OP experienced 100% function with 124gr ammo.

The OP had problems with 115gr ammo in the other thread, and this one too, and was hesitant to believe a simple switch to 124gr ammo would fix his problem.

I wasn't hesitant to believe that 124gr ammo would fix the problem. I just find it hard to swallow that a compact 9mm pistol will only function reliably with one bullet weight. If the issue is simply a bullet weight problem then I should've experienced the same rate of malfunctions with the 115gr ammo. It was 2 total failures vs at least 20 failures previously.

I've got another 150 rounds of different brand and bullet weight ammo to shoot. If after the next 150 rounds (total of 225 rounds from new) the pistol continues to experience failures then back to Sig it will go. This pistol was bought to be my new EDC so any failure after some break in is unacceptable if I plan to trust my life and my families life to it.

 

[JTQ]

I wasn't hesitant to believe that 124gr ammo would fix the problem. I just find it hard to swallow that a compact 9mm pistol will only function reliably with one bullet weight. If the issue is simply a bullet weight problem then I should've experienced the same rate of malfunctions with the 115gr ammo. It was 2 total failures vs at least 20 failures previously.

The issue is "when new". Your gun won't only function with 124gr ammo, it will eventually probably function with nearly any 9mm ammo you can find, but when new, and the springs are stiff, the gun needs a round with enough "oomph" to drive the slide.

The economy 115gr stuff you've tried doesn't have that "oomph". The 124gr ammo does and your gun works fine. Once the gun is broken in with a few hundred rounds, all should be well.

This is not limited to your SIG P365, but is a common problem experienced with a lot of the cheap 9mm training ammo available today.

 

[bannockburn]

CarJunkieLS1

I have three well used 9mm.s (Glock 17, Steyr M9, and a Manurhin P1), that sometimes have problems with 115 gr. ammo (most notably WWB). Switch to 124 gr. or 147 gr. and they all work just fine.

 

[sequins]

I'm surprised to hear you're still experiencing so many failures woyh different types of ammo. I'd send it back to sig the 365 should be reliable out of the box based on other reports.

 

[Hartkopf]

So what am I missing here when it comes to muzzle energy? Won't a higher ME work the slide harder regardless of bullet weight?

WinWhiteBox: ---115gr--1190fps--360ME
FedAmericanE:--115gr--1180fps--356ME

BlazerBrass:------124gr--1090fps--327ME <<<<<<< Wouldn't this be the softest shooting/lower slide velocity? Not for over sprung guns?

 

[JTQ]

How about this thread regarding heavier bullet and more recoil

https://www.thehighroad.org/index.php?threads/how-does-bullet-weight-affect-recoil.526564/

 

[Old Dog]

I personally would never, ever use Winchester white box 115 grain as one of the first loads through any new pistol (unless I needed to practice malfunction-clearing drills). Aside from the fact that it's filthy, it's notorious for hard primers and subject to bad lot (always check the OAL of each cartridge before loading mags if you do desire to use that stuff, most especially with micro-pistols).

The economy 115gr stuff you've tried doesn't have that "oomph". The 124gr ammo does and your gun works fine. Once the gun is broken in with a few hundred rounds, all should be well.

I can concur with this.

I ran 400 rounds of Speer Lawman 124 grain through the below 365XL out of the box, perfect functioning.

 

[Hartkopf]

I personally would never, ever use Winchester white box 115 grain as one of the first loads through any new pistol (unless I needed to practice malfunction-clearing drills). Aside from the fact that it's filthy, it's notorious for hard primers and subject to bad lots.

I can't hardly get WWB to screw up. One dud over the last year with aprox 2000 rounds between my family and I. Maybe it was way worse in previous years?

 

[<*(((><]

I've had good luck with WWB, dirty yes, but not cycling issues.

 

[Old Dog]

One dud over the last year with aprox 2000 rounds between my family and I. Maybe it was way worse in previous years?

Depends on the pistol. Decent quality full-size service pistols such as S&W M&Ps, Beretta M9/92FS, S&W 5906, Ruger American, Glock 17 typically don't have as many issues with it, but the history of WWB over the years has been checkered..

 

[TomJ]

OP,
I had mentioned before that Sig replaced mine due to all the problems I had. FWIW over 3 range sessions I ran 500 rounds of 115 grain PMC, 200 rounds of 124 grain HST, 50 rounds of my reloads (also 115 grain) and 300 rounds of Wolf 115 grain ammo through it. The only issue I had were 2 for 3 times it not locking back upon shooting the last round in a magazine, but I was shooting in the cold with gloves on so it was most likely me and twice the slide slammed shut when I inserted a magazine. No failures to go into battery at all. I used the ammo in the order I mentioned, so it worked fine right off the bat with the PMC ammo.

 

[CarJunkieLS1]

So your pistol worked fine with pmc 115gr right out of the box? Hmm but but but 115gr doesn't have the "oomph" to run the slide.

The WWB was a box I had left from years ago and my Taurus PT709. I don't agree that the issue is 115gr vs 124gr ammo. I do however agree that the gun may be "tight" which is a good thing but may cause issues early on. After the second through cleaning and lube it worked much better with "weak" 115gr ammo I shot the 124 AE ammo last so it would have been shot when the gun had been broke in more...this is all just my thoughts sitting here on break at work. So if it comes off rude I really do apologize.

Bottom line is that after another 150 rounds or so of various brass cased ammo if I still experience failures then back to Sig it will go.

 

[9mmepiphany]

I thought 124 grain was a standard weight in 9mm. Or have I misunderstood your post?

Slight misunderstanding because I didn't quote his whole sentence and I was referring to his hesitance, in an earlier thread, the believe that bullet weight would play a major role in the function during break-in.

Yes, 124gr is the standard weight for 9mm. 115gr is considered light of the chambering and 147gr is heavy. My habit is to always break in or do initial function testing with the original designed weight bullets...especiallly when the pistol is a smaller platform

 

[9mmepiphany]

So what am I missing here when it comes to muzzle energy? Won't a higher ME work the slide harder regardless of bullet weight?

No it won't because it isn't a matter of the high ME working the slide, but a matter of the initial recoil impulse of the heavier bullet