P365XL and 124 Grain HST?

[TomJ]

I have a P365XL which had a light primer strike issue. It was sent to Sig for repair and I was at the range with it today. I put 150 rounds through it without issue using 115 grain Blazer ammo. I then tried my carry ammo, 124 grain +P HST and had this stove pipe after 25 rounds. I did a quick internet search and saw where some people had issues with HST's in their P365XL's. Has anyone with this gun experienced this issue with HST's? I don't have a problem changing to another SD ammo but thought I'd get some feedback before I started burning through different types of SD ammo.

 

[JohnKSa]

That's not really a stovepipe. A stovepipe would look like that but with an empty case--it's an ejection failure. In a stovepipe, the round would fire and the empty case would extract and then end up caught between the slide and barrel when it failed to eject clear of the gun. True stovepipes usually mean that the slide velocity isn't sufficient to get proper ejection or that there's something wrong with the extractor/ejector interplay--but again, that's not what's happening in your gun.

What you have is a feeding problem, and not a very common one, either. It looks like the bullet hit the feedramp during the feed cycle and then bounced hard enough to get the round aiming upward where it could be trapped between the barrel and slide instead of feeding into the chamber. That's a strange one. I don't really know what is going on there.

 

[SG1]

I have a P365X and carry 147gr HSTs and have had zero issues with the ammo. Hope yours is an easy resolution.

 

[JmacD]

My dad’s XL did that with one type of ammo(don’t recall what) and one magazine. Only that one magazine. And it’s had probably 2k ish rounds through it.

 

[JTQ]

Do you have any lubrication on the magazine feed lips?

 

[TomJ]

Do you have any lubrication on the magazine feed lips?

No, I’m not seeing any.

 

[Walkalong]

That's odd, have another mag to try?

 

[JohnKSa]

My dad’s XL did that with one type of ammo(don’t recall what) and one magazine. Only that one magazine.

Ok, that's very interesting. I was initially wondering if maybe the magazine was holding onto the round too tightly and not letting it go to bounce up and into the chamber. If the feedlips were too tight, they might hold the round like that and prevent it from feeding properly.

That's odd, have another mag to try?

Yup, mark your mags and see if you're only getting this type of malfunction with one of them.

 

[TomJ]

It happened on the last round of one of my 17 round magazines. I'll load that magazine with 1-2 rounds of HST and try recreating it when I get back to the range, hopefully tomorrow.

 

[jonnyc]

That's all I carry in my 43X. Never a problem with HSTs.
"Try another mag" or two is the best suggestion. Even though I'm partial to the Glock and rejected the Sig, I can't imagine a 365 not functioning with HSTs.

 

[JTQ]

I was initially wondering if maybe the magazine was holding onto the round too tightly and not letting it go to bounce up and into the chamber.

It happened on the last round of one of my 17 round magazines. I'll load that magazine with 1-2 rounds of HST and try recreating it when I get back to the range, hopefully tomorrow.

I'd guess the mags are not holding too tight, but they are letting the round loose. I'd guess inertia feed. The mag is letting go of the round too soon. Light gun, higher than normal recoiling round (124gr +P ammo).

When you're testing with the one or two rounds (it happens with the last round because that's where the mag spring has the least tension on the round), make sure you have a very firm grip on the gun. Don't let the recoil beat you, and see if that helps.

 

[9mmepiphany]

I'd guess the mags are not holding too tight, but they are letting the round loose. I'd guess inertia feed. The mag is letting go of the round too soon. Light gun, higher than normal recoiling round (124gr +P ammo).

When you're testing with the one or two rounds (it happens with the last round because that's where the mag spring has the least tension on the round), make sure you have a very firm grip on the gun. Don't let the recoil beat you, and see if that helps.

Sorry for being a little late to the party, but the above sounds right.

It is indeed a feeding issue but it is likely due to the magazine. If it were the first round it would be too much spring pressure combined with slightly wide lips causing the round to jump up as the slide/extractor cleared the previous empty.

When it is the last round in the magazine, it usually indicates that there is not enough spring tension and the cartridge isn't being held against the lips for the returning slide to pick up.

The first step would be to try a different magazine. If the other one works, switch the spring from one to the other...that should tell you if it is the spring or the magazine

 

[TomJ]

I'm officially stumped. I just got back from the range, where I'd load 2 rounds at a time into the magazine and went through 50 rounds of HST's. There were no malfunctions. I had another 30 rounds of 115 grain Blazer ammo with me and shot that without a malfunction. That makes about 250 rounds through the gun with the one malfunction. I'm wondering if it was fluke that won't reoccur. I probably won't be able to make it back to the range for a couple of weeks and will put a couple of hundred more rounds through it then.

 

[C-grunt]

Take the mags apart and give them a good clean. Im with the theory that the last round wasnt being held in tight enough. If it's not repeatable then maybe it's not a mag body or spring issue, but maybe the follower got stuck up on some fouling?

 

[JohnKSa]

I have one gun with mags that malfunctioned the first time they were used but then after that they were reliable. Could be something like that. If you can't get it to recur with a couple hundred more rounds, then I think, at the least you've proved that it's not likely to malfunction.

 

[JDeere]

The 124 HSTs and 124 fmjs is all I run in my 365XL and has never been an issue. Between the wife and I we have about 6 12 round mags and they all run well...

 

[Whiskeyhotel2020]

Did you buy the pistol new? If so maybe just needs to be broke in. The instruction manual says 300 rounds I believe. I've had mine since 2020 and have switched the grip module to a Wilson combat and it eats every thing I out through it so far

 

[halfmoonclip]

A break in for 365s? That's news to me.
Is it possible that the malfunctioning round itself was out of spec?
BTW, the suggestion of numbering mags is a really good one.
Moon

 

[TomJ]

Did you buy the pistol new? If so maybe just needs to be broke in. The instruction manual says 300 rounds I believe. I've had mine since 2020 and have switched the grip module to a Wilson combat and it eats every thing I out through it so far

I did buy it new. I'm not sure how many rounds are through it, but it is over 300.

 

[Tinman357]

I've had that exact same type of flub on a few different guns over the years. Every single time it was on a new gun and always tracked back to grit in the magazine. Cleaned the mags, never happened again.

 

[TomJ]

I've had that exact same type of flub on a few different guns over the years. Every single time it was on a new gun and always tracked back to grit in the magazine. Cleaned the mags, never happened again.

I cleaned the magazines after the last time I shot it and hope to be able to get back to the range Friday. Hopefully that corrects it.

Edit- I just checked the weather forecast for Friday and we’re due for single digit temperatures. Our range is outdoors so I’ll get out there when it warms up a little.

 

[Astro14]

I’ve put over a hundred rounds of HST 124 grain (not the +P, the regular*) through my P365XL.

Zero malfunctions.

The weird feed (and it’s a feed issue, not a stovepipe, which is a cycling issue) on that suggests a magazine problem.

Swap mags, clean and lube the gun, try again.

*I don’t keep the +P around because my wife’s Walther CCP works great with regular pressure 124 Grain. It has a gas piston recoil management system, which Walther calls “softcoil”, and it will respond differently to the higher pressures. I found a cartridge that works, then bought a case, so, it’s what gets tested/carried in everything else.

 

[TomJ]

Temperatures warmed up to the mid to upper 30's here and I was able to make it out to the range. Another 200 trouble free rounds, including 50 standard pressure 124 grain HST's. I was due to rotate my carry ammo and picked up some of the standard pressure HST's, which is what I'm sticking with in this gun. With the one malfunction in 450 rounds, including the last 280 rounds without an issue, I'm calling it good.