Larger Threads At End of Barrel?

[EzGoingKev]

OK. I know he posts here as Constructor but I had no idea what his actual name is.

[bruin]

Keep in mind, some muzzle devices are optimized for a particular caliber (i.e. Precision Armament hybrids). Differences in gas volume and bullet "seal" may reduce the performance for a device compared to it's advertised effect. Also, pretty much every 30 cal device weighs more than it's 22 cal equivalent. Just some things to consider.

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[tom12.7]

Bruin's statement is true, but in the past at least, many were more concerned about gas pressure imbalances that can effect precision/ accuracy. They wanted more of a distance from the projectile OD to the bore ID of some devices. Not meaning all by any means.
To the OP though, the base barrel's manufacturing process has an influence into the degree of this. Also, it is known that reducing thread diameters smaller than the normal ones can magnify this greatly, i.e. 1/2x28 .308 barrels, etc..

[EzGoingKev]

I would love to see some chrono info for two barrels, same ammo, same day, etc with the only variable being the thread sizing at the muzzle end. Some groups too. Preferably the testing would have been done without any muzzle device installed.

Probably too much to ask for.

[tom12.7]

Also, without an intent to derail this discussion, but with an intent to expand that if desired. We could look into some differences between having that portion of the barrel in a extension tensile force, or more of a compressive force, and what we would register to for possible MD's. etc..

[tom12.7]

I would love to see some chrono info for two barrels, same ammo, same day, etc with the only variable being the thread sizing at the muzzle end. Some groups too. Preferably the testing would have been done without any muzzle device installed.

Probably too much to ask for.

You'd need a lot more than 2 barrels to get real data from.

[EzGoingKev]

You'd need a lot more than 2 barrels to get real data from.

I got a feeling asking for 2 barrels is going to be 2 too many.

[tom12.7]

Yeah, it gets complicated more than that.

[MegademiC]

Before and after threading should give you "a good idea". That should eliminate barrel to barrel variance.

[Junkie]

I'd expect it to have more to do with accuracy than velocity.