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Showing what a Mosin Nagant counterbore is and how to determine if the rifle has a counterbored barrel. Also how to do a barrel inspection for counterboring,...
26 lis 2012 · If I was going to do it, I'd remove the barrel from the action, using a 4 jaw chuck line up the bore, then counter bore the muzzle. Before you do anything, shoot it to see if it really needs counter bored.
Counterboring is done up to a maximum of about 1/2" from the muzzle. It's purpose is to correct excessive muzzle erosion where the bullet is no longer fully engaging the rifling when it leaves the barrel. If you have a foot of rifling missing in the barrel, the barrel needs to be replaced.
18 paź 2018 · Just getting into working with the lathe and am going to chamber a few practice barrels before I go at my expensive one. I was told by a guy that he just skips the "counter-bore" when working on a 700 and does it like a Savage. He claims that it doesn't cause any issue.
This dual-spindle, deep-hole drill and reaming machine (Pratt & Whitney) is used for new barrels and for reboring. In the background are finish bore reamers and counter bores. It may take up to five reamers rotating at 350 rpm and reaming up to 2 inches per minute to reach a desired bore diameter.
26 gru 2018 · Counterboring was done for different reasons, including muzzle wear, dings, and even near-muzzle barrel bulges. The Soviets had a maximum allowed depth (which I don't remember off the top of my head, maybe 25 or 30mm) beyond which the barrel was to be scrapped rather than counterbored.
25 gru 2018 · They basically counter bored the barrel back from the muzzle end about an 1” or so. A big benefit was it made the rifle noticeably quieter. Click to expand...
