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How does the lip of your extractor look?

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Check bolt gap.

One way to feel it is with the carrier closed, try to cam the charging handle open, it should open with a little bit of force but if it's unusually hard, your trunnion may be wearing.

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Hope you figure it out bud and sorry about dropping your gun on the ground today.  

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All the ammo used today was the same brand, all the ammo used on first range day was a different brand.





It started out good, first 40 or so rnds was fine, I didnt pay attention to ejection pattern, but looking at where I found the brass, it looks like the ejection was slowly getting weaker (brass being launched shorter and shorter)


the 3rd mag was when it started messing up.





Had a couple of FTE, the spent brass was still sitting on the boltface when the bolt tried to pick up a new round from the mag. Kind of sounds like an ejector problem, BUT it got progressively worse, to the point where I had total failure of cycling, leaving the empty brass in the chamber and I had to cycle it manually... (I had to put some a*@ into it when I worked the charging handle, it was way harder to open than with normal operation)





Could it be that a gradually slower bolt speed would induce failures to eject, and finally failure of cycling..??


The fact that the brass towards the end of the shooting session had very little "flute marks" on them makes me think the flutes where getting "gunked" up to the point where the round got stuck in the chamber...





My buddy was there with his FAL, I tried the ammo through his gun and it functioned fine....

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Is the PTR the one that got dropped? If so pull out your bolt and carrier and look for any excessive wear marks where the receiver or cocking tube may have been bent and causing it to bind. If not, I would also check to see if the carrier has free movement in the stripped receiver.

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I had this happen to me once, I was shooting some stuff that used tar as a bullet sealant.  The tar was getting blown back into the flutes where it collected, and eventually it stopped cycling until I cleaned it out thoroughly with brake cleaner and a 20ga brush.  Now I only shoot that stuff in my FAL.

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I bought a PTR 91 GI about a week ago, took her to the range last Friday and ran about 40 rounds through her without a hickup... fast forward to today, back on the range to shoot some PRVI .308 I picked up.

About 3 mags in I had the first malfunction, round stuck in the chamber, cleared it, loaded back up and shot some more, had rounds stuck in chamber or partially extracted until it finally just stopped cycling....



I did notice after the fact, that the ejection pattern started at 30ish foot, at 1-2 o'clock,  and came closer and closer until she started choking completely...

I did also notice that the spent brass became less and less deformed (neck part of brass still got deformed as usual)



I am assuming that the fluting was getting clogged up... but 100 rnds shouldnt be enough to have that to happen, should it..??
ETA:



Good news: cleaned the gun up good yesterday, headed back to the range today with a mix of pmc, georgia arms and PRVI ammo...



Rifle ejecting strong again (like next county strong)

I only fired 10 rounds of the prvi stuff, but I'm pretty sure this ammo is the culprit, after all, the rifle was working like a champ again, and the only thing I did was cleaning her up...





Bad news: I have around 850 rounds of this prvi ammo that my rifle hate.. and my only other .308 is a bolt action...

If I only had some rifle dropping friends that offered to buy some from me....



Thanks for all the responses guys, I'm gonna keep testing out this ammo some more, but I'm pretty sure it is the problem..