Need help you guys, New build, liberty 18" barrel,Mega lowwer,Dillon upper. Went to the range Sunday,got set up charged the rifle,it just went CLICK, I said S***,noticed the bolt didnt close all the way,stayed open about 3/8 of an inch.extractor is not going over the case,just hammering it,nice indents on my LAPUA brass.If I take a shell case and maually fit a case under the extractor holding the case inline with the chamber 3 times out of twentyfive times the case will chamber all the way.What am I not seeing?
when the case goes in the bolt does it stick in or does it fall our freely im talking about the extractor and when u hand push the round in...also have you taken the bcg out and seen if a bullet fir in the chamber with no problems
For what it's worth:
My multiple chambering problems all disappeared when I bought a Wilson case gauge.
Posts: 202
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Joined: Jul 2011
Just a little tip, on any new builds always test them out with factory loads first. I seen many people spend countless hours and money trying to "fix" a new gun when it fact it was their reloads causing the issue.
Go back to the range with a box of factory loads and see if the issue persists.
Are you using reloads???
I had the same problem with my liberty barrel when I first started reloading for my Grendel. It fired AA and Wolf with no issues, but my reloads weren't letting the bolt lock. It turns out that I was using an RCBS shell holder along with my Redding dies. It appeared that the RCBS shell holder was a little too thick. It wasn't allowing the sizing die to come down far enough and wasn't resizing the last little bit of case. This was making the brass stick in the chamber. I took that RCBS shell holder and sanded off a couple thousands from the top of the shell holder. Now, my sizing die goes all the way down the case and I haven't had a chambering problem since. The only other problem I had was a couple round were just a little too long and would stick in the lands. But, that was a simple enough fix.
So, take some calipers and check the diameter of the bottom of your case and make sure it isn't a little too fat.
But, a wilson guage would be an even better route. If they fit the guage, there shouldn't be any chambering issues.
Sounds like ammo has too long of headspace. I'll bet it isn't even .005 of an inch too long.. In my Grendels, even cases that are .002 inch too long will do exactly what the OP describes. If I try to chamber them 3-4 times, the hammering of attempting to chamber them pushes the shoulder back the required .002 inch, then they chamber.
I'm betting factory ammo fixes the issue.
Using the RCBS shellholder, its the same one as 7.62x39 right?
Who knows what kind of chamber Liberty used on that one too...If it's a .295" neck diameter, that would really suck, unless you get dies that will size your neck that small. Check to see if you have a Grendel vs. one of the other unlicensed chambers.
I had some chambering problems a couple of years ago. I was using a RCBS shellholder in a Redding Press with Redding Dies.
My final solution was to take shellholder and some fairly fine, 280 grit wet dry sandpaper on a glass plate and spent about 10 minutes rubbing the top face of shellholder so that a case can enter the die just a bit more. I did not measure before or after, just tired a few cases until I got to a point where chambering was easy.
I have had no apparent problems with cases reloaded using the modified shellholder.
I will second davidj comment. I was not rimming the outer case opening with the deburring tool and I found out that my case shoulder was being crushed by the seating/crimping die. Once I deburred the case mouth and put a very light crimp on my round, the chambering with without hiccup.
