I've got a Remmie 700 VTR in .223 that I can't seem to get to perform better than about 1.5 minutes at 100 yards, even on sandbags. It's been driving me nuts, so I decided to take some photomicrographs before returning a borrowed USB 'scope.
I've abandoned the ultralight VTR stock and replaced it with a Choate, and ground away a contact point where the stock was touching the barrel. It SHOULD be full floated at this point, standard paper-strip-as-feeler-gage all the way to the receiver.
Obviously, re-barreling is on my list of things to do BUT, I'm wondering if the burr I think I see could be the reason for the performance? (Pics below.)
The odd counter-bored integral comp looks like it was blind cut with a flush end mill. There appears to be somewhat of a countersink also.
Am I seeing a burr at the bottom of the flush cut? If so would some kind of crowning be warranted before writing off this barrel? I was thinking of abrasive crowning, as I don't think any real piloted crowning tool will be small enough in diameter to fit down that hole (.346 diameter FWIW.)
I've abandoned the ultralight VTR stock and replaced it with a Choate, and ground away a contact point where the stock was touching the barrel. It SHOULD be full floated at this point, standard paper-strip-as-feeler-gage all the way to the receiver.
Obviously, re-barreling is on my list of things to do BUT, I'm wondering if the burr I think I see could be the reason for the performance? (Pics below.)
The odd counter-bored integral comp looks like it was blind cut with a flush end mill. There appears to be somewhat of a countersink also.
Am I seeing a burr at the bottom of the flush cut? If so would some kind of crowning be warranted before writing off this barrel? I was thinking of abrasive crowning, as I don't think any real piloted crowning tool will be small enough in diameter to fit down that hole (.346 diameter FWIW.)