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SIG p365 is chewing the chambered ammo

1423 Views 17 Replies 13 Participants Last post by  Stick486, 
M
My sig p365 has been running flawless after 150 rounds but I noticie that it is chewing up the chambered ammo, leaving some cut marks on it. Is that ok?
I use CBC 124 gr FMJ .

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H
I have some cheap ammo that comes like that outta the box. Are you sure the hun itself is causing it?
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M
HanSoulo said:
I have some cheap ammo that comes like that outta the box. Are you sure the hun itself is causing it?
Click to expand...
The ammo had no cut marks before chambering.
I'am just curious if someone experienced the same issue.
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SMISSCCJ
I’ve not noticed on mine, but this will remind me to check.
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RolexGMT
I would definitely call sigs customer service and explain to them what you just told us! Just to make sure your safe with that type of rarity!! 603-610-3000 ext 1
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SigSlider
Mine does the same thing. No issues (600+ rounds through it). I cycle my carry ammo so each round is chambered once and then fire that lot out once I cycle through the stack. Never an issue.
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Rich Jenkins
I'm not sure I'm tracking...you are loading a mag, chambering a FMJ round...and then not shooting it? You are then removing it to check for "marks"? Is that what you are doing? May I ask why you are doing this?
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tommyh
Not sure I'd call that chewing up. Looks very minor, and I don't think it would have any effect on accuracy. Might just be the bullet hitting the chamber at a weird angle. I wouldn't be especially concerned.
Rich Jenkins said:
I'm not sure I'm tracking...you are loading a mag, chambering a FMJ round...and then not shooting it? You are then removing it to check for "marks"? Is that what you are doing? May I ask why you are doing this?
Click to expand...
+1, I'm curious as well.
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M
Rich Jenkins said:
I'm not sure I'm tracking...you are loading a mag, chambering a FMJ round...and then not shooting it? You are then removing it to check for "marks"? Is that what you are doing? May I ask why you are doing this?
Click to expand...
We usually use FMJ for self defense in my country. We don't have easy acess for a good quality hollow point. Sometimes unchamber the round is needed.
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Sig007
I rotate ammos from mags more frequently but never seen them like that ..
still look brand new .. !!
I wouldn’t call it problems but very unusual?
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Rich Jenkins
Mindtilt said:
We usually use FMJ for self defense in my country. We don't have easy acess for a good quality hollow point. Sometimes unchamber the round is needed.
Click to expand...
Ah - I see.

As a side note, it would be worth considering how chambering affects ammo. In particular, when you chamber a round, the primer cup receives several impacts during the process. Repeated chambering the same round can result in the cup disintegrating. Not a good situation. In addition, its also possible to have the bullet be set back in its casing, if done over and over, compressing the powder. This could result in an over pressure situation. Also not good.

You may want to mark the casing with a sharpie each time you chamber it, to keep count, if you are relying on it for self defense. You will get opinions on how many chambering are ok, a popular answer is no more than 4. I’m risk averse so I don’t chamber SD ammo more than once,

As to your question on ammo: Any marks on the bullet obviously have to be ‘from’ something. Can you post a good detailed picture of the chamber, including the feedramp?

As a complete guess, your ammo may be contacting the rear of the feedramp, or side of the chamber, on its way in.
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Rich Jenkins said:
Ah - I see.

As a side note, it would be worth considering how chambering affects ammo. In particular, when you chamber a round, the primer cup receives several impacts during the process. Repeated chambering the same round can result in the cup disintegrating. Not a good situation. In addition, its also possible to have the bullet be set back in its casing, if done over and over, compressing the powder. This could result in an over pressure situation. Also not good.

You may want to mark the casing with a sharpie each time you chamber it, to keep count, if you are relying on it for self defense. You will get opinions on how many chambering are ok, a popular answer is no more than 4. I’m risk averse so I don’t chamber SD ammo more than once,

As to your question on ammo: Any marks on the bullet obviously have to be ‘from’ something. Can you post a good detailed picture of the chamber, including the feedramp?

As a complete guess, your ammo may be contacting the rear of the feedramp, or side of the chamber, on its way in.
Click to expand...
Ty for reply.
Here is a picture of the feedramp and chamber.
Maybe the chamber is a little short. The gun is runnig flawless, cut marks on the ammo are no big deal i guess.

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bumper
Mindtilt said:
My sig p365 has been running flawless after 150 rounds but I noticie that it is chewing up the chambered ammo, leaving some cut marks on it. Is that ok?
I use CBC 124 gr FMJ .
Click to expand...
Looks like the bullet ogive is striking the angled edge at the top rear of he chamber. You might first check the easy stuff, field strip and take a new cartridge and see how it slides up the breech face and under the extractor claw. It should do so with minimal friction and only slight additional friction as the case rim goes under the claw - no brass shaving. Additional friction here may cause the cartridge front to pivot upward more than it otherwise might, and thus strike that chamber edge. This is just a WAG.
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Rockwell15200
Or is the round dipping and impacting the front edge of mag during the cycle as the pictured feed ramp is pretty clean.
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Sig007
Mindtilt said:
Ty for reply.
Here is a picture of the feedramp and chamber.
Maybe the chamber is a little short. The gun is runnig flawless, cut marks on the ammo are no big deal i guess.
Click to expand...
It's okay since it works fine ,
Although it looks very rough to me , try to polish it
I normally put a little tinny grease "Slide-Glide" on Slide contact

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R
I might be totally off base here, but here’s my suggestion as I would be really concerned about bullet setback if the sizing was too loose on the casings.
Mark the case with a sharpie pen, then make a thin (as in thickness) band of paint in the impact area of the bullet.
Orientate the sharpie mark upward in the mag and chamber the round. The most paint left in the chamber is your impact point, and if all the paint gets scrapped off, one still has the mark on the case to go by to see if the problem is top or bottom.
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D
Are you loading mag in magwell and hitting slide lock lever? Don't ease slide forward, semi autos don't work like that.
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Stick486
Mindtilt said:
150 rounds but I noticie that it is chewing up the chambered ammo, leaving some cut marks on it.
Click to expand...
I had a Beretta that did that same thing starting w/ the 1st round...
sent it back to them and they slightly chamfered the rim of the chamber w/ a higher/deeper degree of cut to the bottom of the chamber... that cut/indent mark never showed up again..
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