Muzzle constriction from threading.

If it’s a button rifled barrel the odds are the bore would open up slightly if it wasn’t stress relieved well. Cut rifled barrels are very stable and not known to increase.

It may be possible, but I’ve never heard of either constricting.
 
I hadn't heard of any contriction happening, and know it's a possibility to open up. I wondered if possibly being too aggressive in material removal could do it.

Could have also been a tight spot in the bore that it happened to be cut at too.
 
I wondered if possibly being too aggressive in material removal could do it.
The lathe cuts for that kind of threading are relatively light, so it sounds like the tight spot was there beforehand. There is a method to shrink a steel tube, but it would never be done on a barrel.

How tight is it? Is the gun still accurate?
 
Last edited:
The lathe cuts for that kind of threading are relatively light, so it sounds like the tight spot was there beforehand. There is a method to shrink a steel tube, but it would never be done on a barrel.

How tight is it?

It turns out it isn't, or if it is its not detectable with a range rod.

Apparently it's a different problem, that's just one thing that was first offered and I can't figure out how the bore would choke from threading unless it was done wildly incorrectly, but I'm not a machinist.


Issue was with subsonic rounds keyholing, and that was first offered as a possibility. Gun is going back now.
 
Back
Top