XCR and cratering
- Thread starter Bare
- Start date
I recently had an opportunity to inspect one of these rifles, and noticed the peculiar appearance of fired primers. Occurred with ammunition of different makes.
Looks as if the firing pin hole in the boltface has been countersunk.
Almost looks as if a deburring operation went way too far.
I cannot imagine that this countersinking would be done intentionally.
Looks as if the firing pin hole in the boltface has been countersunk.
Almost looks as if a deburring operation went way too far.
I cannot imagine that this countersinking would be done intentionally.
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Got about 400 rounds through mine, no sunken primers yet!!! Using 55gr.PMC ammo. I had it at the '4' setting for break in with no FTF or FTE. Must admit I haven't really checked the bolt face that closely though. I check it later and report my findings....
This isn't a sunken primer situation - the primer is extruding back into the countersink around the firing pin hole. Its a raised cone, with the firing pin indent in the centre. Have a look at your fired cases, if its there, it is really obvious, or, look at the boltface. If the bolt was machined this way intentionally, I cannot conceive of why it was done.
I know they initially had some problems (mine did) with punctured primers. The easiest way to solve it according to XCR monger was to gently break the edge of the firing pin hole, as the 90 degree angle was to blame. They offered to replace my bolt, but suggested that it could be fixed DIY. I DIY'ed it with a dremmel and a small ball bit and just gently broke the edge off.
Now I get absolutely no problems with pierced primers. All I get is a littel bt of cratering around the "larger" firing pn hole.
I haven't had a problem since.
Now I get absolutely no problems with pierced primers. All I get is a littel bt of cratering around the "larger" firing pn hole.
I haven't had a problem since.
Ok, went & had a look. I checked out my used brass, have no issues of extruded primers or pierced as drvrage mentioned. Pulling the bolt back I see what your talking about though. There does indeed seem to be a very slight counter sink around the firing pin hole.
I'm not sure if the counter sink on mine is anywhere near the diameter of the primer face & it's very shallow at that... No real idea why it's there either? Deburring the edge maybe? My rifle came from the last batch that were imported over here though & maybe the bolt face has been modified since, as some have mentioned...
Again I'm using the PMC 55gr ammo with no problems. Used the Remington bulk shate at 1st & as you can tell, didn't think much of it. But I still had no primer issues, only accuracy ones! Hope this helps...
I'm not sure if the counter sink on mine is anywhere near the diameter of the primer face & it's very shallow at that... No real idea why it's there either? Deburring the edge maybe? My rifle came from the last batch that were imported over here though & maybe the bolt face has been modified since, as some have mentioned...
Again I'm using the PMC 55gr ammo with no problems. Used the Remington bulk shate at 1st & as you can tell, didn't think much of it. But I still had no primer issues, only accuracy ones! Hope this helps...
Cratering is normal. If the firing pin hole is not chamfered they can punch primers, but cratering is NOT an indication of a problem. I've seen about 3500 XCRs ship in my time here, in addition to doing all the repairs for the last two years. Cratering is typical in the XCR.
Ass
This and the thread where they recommended taking a file to the sear is indicitive of poor quality control.
There is absolutely no way a rifle that commands this price tag should be leaving a manufacturer in this condition....never mind the recommendation that the owners of the guns should be doing their own 'DIY' smithing.
Buyer beware.
This and the thread where they recommended taking a file to the sear is indicitive of poor quality control.
There is absolutely no way a rifle that commands this price tag should be leaving a manufacturer in this condition....never mind the recommendation that the owners of the guns should be doing their own 'DIY' smithing.
Buyer beware.
Damn it Jim! I am a doctor not a veterinarian, but I think the horse is dead, don't think beating it anymore will do any good.
Ahhh, I see. It's ok to have these XCR threads where all their owners feel the need to get around in a big circle jerk and espouse how wonderful they are to each other and unsuspecting potential buyers, but when someone comes in and points out the obvious flaws, that's beating a 'dead horse'?
In all fairness, Mr fed has owned/owns a bunch of nice rifles and knows how to shoot and maintain most of them. If he is putting the time in to popping up "in every single thread", his comments are worth reading.
