6.5 G / 264 lbc - Failure to extract issues FTE

[Bennybone]

Are the noticeable rings towards the base of the case normal? Each piece of brass exhibits this ring, it doesn't buff off (in other words it isn't grease or grime).

[RugerIte]

Did you put the scope on the free float tube there? Or put it there to keep it with the rifle? If its not a true monolithic that can cause aiming problems also.

[Bennybone]

Dd you put the scope on the free float tube there? Or put it there to keep it with the rifle? If its not a true monolithic that can cause aiming problems also.

It is a true monolithic upper but currently a single shooter

I have decided to wait on going to the range, I have 40 rounds of Hornady 123gr AMAX on the way to simply rule out Wolf ammo (although they were tested by ARP during development).

[RugerIte]

Ooops.

A more experienced person would of noticed that I guess.

[Drifter]

Are the noticeable rings towards the base of the case normal? Each piece of brass exhibits this ring, it doesn't buff off (in other words it isn't grease or grime).

That is potentially a sign of excessive pressure in that particular brass, which would seemingly correlate with stuck cases in the chamber.

If one lot of Wolf is all that has been tried during the period of malfunctions, it could be a hot batch. It will be interesting to see how the Hornady factory ammo does.

[Bennybone]

When the Range Officer came by to observe me clear the chamber of the first stuck case, he looked at the brass and commented along the lines of "what kinda handloads are you running". I told him they were new factory rounds, he then looks at the case and says "hmmm Prvi makes decent brass and your primers looks solid...".

I told him that even if the loads were on the hot side that the barrel and chamber are 264 lbc which is rated at a higher pressure.

He just kind of stood there, I knew he wanted to say it but he didn't...

Sure it may handle the higher pressure but your case is stuck.



Yes after giving the gun a good cleaning yesterday I couldn't convince myself to go to the range today and have a chance of being disappointed, so I ordered the AMAX and figure if those don't work it will at least be a different kind of disappointment.

Hopefully we don't need to bring in the AR Doctor on this build.

BB

[constructor]

All cases swell to the chamber walls as the brass gets thinner(going up the case). The brass just above the groove is thicker and does not swell the the chamber walls.
Most of the time it angles out from the groove until it hits the wall but that is a pretty sharp line, makes me think pressure is fairly high.
If you can, measure the diameter of new unfired cases just above the groove and then measure a few fired case right on top of that ring where it is widest.
If you want, send it to me at the new address and I'll check it out. I have several different types of ammo and can shoot right here in the shop, makes it a lot easier to try things and adjust without driving back and forth to the range, on top of that I have all the tools to take care of anything that needs to be done.

[Bennybone]

All cases swell to the chamber walls as the brass gets thinner(going up the case). The brass just above the groove is thicker and does not swell the the chamber walls.
Most of the time it angles out from the groove until it hits the wall but that is a pretty sharp line, makes me think pressure is fairly high.
If you can, measure the diameter of new unfired cases just above the groove and then measure a few fired case right on top of that ring where it is widest.
If you want, send it to me at the new address and I'll check it out. I have several different types of ammo and can shoot right here in the shop, makes it a lot easier to try things and adjust without driving back and forth to the range, on top of that I have all the tools to take care of anything that needs to be done.

When I get the Hornady ammo I will test fire and report back the results, that way IF the gun exhibits the same issues with that load I can send both types of spent cases and the upper your way.

Hopefully the Hornady cycles perfectly and we can focus on one type of ammo with my chamber, in the end we both have a vested interest in knowing whether I have a picky barrel or if there is something broader in scope at play here associated to Wolf and ARP's 264 lbc.

Still too early to tell BUT I APPRECIATE your offer to take on the troubleshooting and all the knowledge/experience you have shared during the build of my gun.

BB

[Bennybone]

Miraculously I found Grendel ammunition in Pennsylvania at the Cabelas.

I go to the range later this afternoon to see if the gun will cycle the ammunition without that ring/belt towards the bottom of the case

TBC.............

[Bennybone]

I put one round down range of Hornady. The case stuck in the chamber, it exhibits the same sweel towards the base of the case as the previously fired Wolf ammo.This has been a wildly educational and expensive testing experience.I pretty darn upset that I couldn't solve this on my own.H - Please confirm that you can take receipt of the upper, assess and contact me with the verdict.I am sure some have been at this point before, this is new ground for me - I don't really care to have a barrel that has been reamed...That of course is if ultimately it comes to be that it is chamber related. I am guessing that the amount of case swelling and the force that is necessary to manually extract when sending the bolt home a second time is indicative of a chamber gremlin and not an extractor problem...???Also I will send you the magazine and spent cases.BB