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Old 11-20-2020, 10:11 PM

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Threaded barrels

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Hi y'all i would like to know if the rifling on your threaded barrel comes to the end or are they bored back to the barrel proper. The reason i ask this is because when you reduce a barrel by that much the tightest spot is not at the muzzle but perhaps 12 mm back creating a yawing of the bullet hence disrupting accuracy.Scott.
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Old 11-20-2020, 10:16 PM
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I guess that would depend on the barrel.
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Old 11-22-2020, 11:20 AM

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IMHO yes the barrel will be a larger diameter under the muzzle threads
The problem as I see it is that to get enough room around the bullet .400 there is no metal left.
Next time I turn out a threaded barrel I will go .625 or .750 muzzle threads just to have the room to bore and crown it

I definitely saw a change at the muzzle threads in the bore of a anshultz barrel i set up on my rprr
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Old 11-23-2020, 07:31 AM

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The bore does expand from reducing the diameter of the OD like you are thinking. Counter boring to the shoulder of the threads or just back of it is a good idea and works well, the problem is just getting a good crown that deep in there at such a small diameter. It can and has been done fine with as small of a counter bore as 0.250" without disturbing the bullet on exit but it is hard to execute a quality crown.

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Old 11-23-2020, 03:40 PM
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Originally Posted by Nick7274 View Post
I guess that would depend on the barrel.
Well yeah!

My CZ 457 AT-ONE 24" is lands n grooves to the end.
You carry a gun so you are hard to kill... know the law so you are hard to convict.
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Old 11-30-2020, 03:30 PM
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As a practical matter I doubt it affects accuracy.

I have had many done, and if there's a difference you would need $20 ammo and a BR rig and windless range to notice or measure it.

Counterpoint, when I have a muzzle threaded, I slug it and often find a choke point further down. I think this is more significant than worrying about muzzle bore expansion as a result of threading.

Furthermore, every rig I've had threaded shoots smaller groups with a suppressor...Tom
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