6500rpm
In reading some of the ORF posts, excessive chamber pressure was mentioned. I shoot 55gr S&B exclusively at this time and I had something odd happen yesterday shooting. On only one, of 300 shots, I had a round FTE (pulled out about 1/2" and locked up the bolt carrier).
A good whack to the handle released it, and I found the primer had an outy, but was not ruptured.
This is the deal, I thought the guy next to me (devided booths) shot at the same time, but thinking back, it may have been a slam fire as I have seen light primer strikes in rounds that were chambered, but not shot.
I built this on an ORF/Century receiver using a GM barrel (receiver and kit purchased from Centerfire a little over a year ago).
Since then, Century had a recall to spring load their firing pins to prevent slam fires using commercial ammo.
The other concern is how do I verify that the barrel was reamed correctly, and that the neck isn't too tight? I had the headspace go to shit on my last bolt, this one showed a slight change in 300 rounds with even lug contact.
The primer seems to indicate excessive pressure, possibly due to a slam fire, maybe not. All the others look good (dozen or so randomly picked up from inside the booth). Is there something I can look at on the spent cases that can tell me about a tight chamber? Just looking at all options at this time.
Edit-I'd still like some idea's on the subject, but on a whim I measured the length and neck on a fresh round and let it fly home into battery on a stripped bolt. Both measurements remained consistant and you could still see VERY small stake marks at the very tip of the neck from the manufacturing process. The round also dropped out, unassisted, when the gun was tilted up and the bolt carrier pulled back. My concern was pinch in the neck area, but that doesn't look to be the case.
A good whack to the handle released it, and I found the primer had an outy, but was not ruptured.
This is the deal, I thought the guy next to me (devided booths) shot at the same time, but thinking back, it may have been a slam fire as I have seen light primer strikes in rounds that were chambered, but not shot.
I built this on an ORF/Century receiver using a GM barrel (receiver and kit purchased from Centerfire a little over a year ago).
Since then, Century had a recall to spring load their firing pins to prevent slam fires using commercial ammo.
The other concern is how do I verify that the barrel was reamed correctly, and that the neck isn't too tight? I had the headspace go to shit on my last bolt, this one showed a slight change in 300 rounds with even lug contact.
The primer seems to indicate excessive pressure, possibly due to a slam fire, maybe not. All the others look good (dozen or so randomly picked up from inside the booth). Is there something I can look at on the spent cases that can tell me about a tight chamber? Just looking at all options at this time.
Edit-I'd still like some idea's on the subject, but on a whim I measured the length and neck on a fresh round and let it fly home into battery on a stripped bolt. Both measurements remained consistant and you could still see VERY small stake marks at the very tip of the neck from the manufacturing process. The round also dropped out, unassisted, when the gun was tilted up and the bolt carrier pulled back. My concern was pinch in the neck area, but that doesn't look to be the case.