Will threading the end of my .22 bbl affect acuracy?

[mercuryv8]

So like the title says, I am interested in threading the end of my .22 CZ 452. Will that affect the accuracy of my rifle? People always talk about protecing the crown because you could damage it while cleaning and so on... with the threads near the outside of the crown will it make that much of a difference?

Nic

Would you recommend a gunsmith near Edmonton that I should go too?

 

[Spectre]

...

 

[Duck_Hunter]

I've read many articles on .22 rimfire accurizing by Bill Calfee, he seems to know what he's doing. He is a firm believer that a rimfire barrel (or any barrel for that matter) should be made so that the barrel is crowned in the tightest area of the bore. He also suggested that many things affect this including contouring, lapping, etc.
I would imagine that a barrel already contoured/crowned, lapped would see a slight enlargment of the bore if material is removed for threading.
Anyways his theories seem to make sense to me, your opinions may differ.

 

[JohnC]

as long as you don't affect the rifling to barrel front interface you should be OK. one advantage of threading is that it allows you to change your barrel harmonics if you add a compensator or flash hider because of the extra weight and use spacers to change the comp distance to tune the system for accuracy . that was the premise of the Browning B O S S system.

I put a DPMS Levang linear comp on a threaded 10.5 inch E.R Shaw barrel on a 10-22 and my group sizes ( using a red dot, not the most accurate system for me) decreased by 1/2 . Needless to say I was pleasantly surprised as I was only looking for a bit of rapid fire stability

 

[Weapontech]

Aside from everything else mentioned, there is another important item that you must keep in mind when modifying any barrel from a stock configuration; it's called harmonic resonance.

Simply put, every barrel (yes, even a .22) "distorts" to a certain degree with every shot fired. If properly designed, the barrel returns to its original configuration prior to the shot being fired, regardless how miniscule. Of course, this effect is somewhat negated using a heavier "target" barrel, but remains a ballistic influence just the same.

To thread a barrel and hang whatever off the end, (where it was never designed to have one to begin with) will likely have some effect on the harmonic resonance designed into the stock barrel; and as a result, accuracy. However to what extent good, or bad is anyone's guess. It might help (as per above), do nothing at all, or create significant accuracy problems.

For what it's worth, IMO threading your CZ is only going to de-value (and possibly ruin) what is already a nice little shooter.

 

[mercuryv8]

Aside from everything else mentioned, there is another important item that you must keep in mind when modifying any barrel from a stock configuration; it's called harmonic resonance.

Simply put, every barrel (yes, even a .22) "distorts" to a certain degree with every shot fired. If properly designed, the barrel returns to its original configuration prior to the shot being fired, regardless how miniscule. Of course, this effect is somewhat negated using a heavier "target" barrel, but remains a ballistic influence just the same.

To thread a barrel and hang whatever off the end, (where it was never designed to have one to begin with) will likely have some effect on the harmonic resonance designed into the stock barrel; and as a result, accuracy. However to what extent good, or bad is anyone's guess. It might help (as per above), do nothing at all, or create significant accuracy problems.

For what it's worth, IMO threading your CZ is only going to de-value (and possibly ruin) what is already a nice little shooter.

Good points everyone. I didn't consider barrel harmonics although I really thought that was only a high power rifle issue.

Since I don't intend on selling my CZ, what it's value is makes no differnce to me. Although the thought of buying a factory threaded barrel seems like a nice idea.

I was planning on making a custom front and rear sight, what are my options as to attatching the front sight? I wanted to thread up to a flange (just like a muzzle break) I don't really want to use a dovetale because I want to be able to remove the sight and thread on a cover to make the barrel look clean again.

Any Ideas? Is this just crazy?

Nic

 

[tiriaq]

Target rifles commonly use banded front sight bases. The base clamps to the barrel, no alteration to the barrel is necessary.
Installing a front sight on a threaded on collar is the hard way of doing it. It would have to have provision for indexing, as it is screwed into place.
Muzzle attachments certainly can affect barrel harmonics. They are often used to improve accuracy.
If you do decide to thread the muzzle, it should be properly done on a lathe by a 'smith who knows what is involved.

 

[mercuryv8]

as long as you don't affect the rifling to barrel front interface you should be OK. one advantage of threading is that it allows you to change your barrel harmonics if you add a compensator or flash hider because of the extra weight and use spacers to change the comp distance to tune the system for accuracy . that was the premise of the Browning B O S S system.

I put a DPMS Levang linear comp on a threaded 10.5 inch E.R Shaw barrel on a 10-22 and my group sizes ( using a red dot, not the most accurate system for me) decreased by 1/2 . Needless to say I was pleasantly surprised as I was only looking for a bit of rapid fire stability

That DPMS is that this thing

The brownells catalogue says it reduces muzzle jump and recoil? Seems like it would increase recoil by directing the rifle toward you.

 

[mercuryv8]

Target rifles commonly use banded front sight bases. The base clamps to the barrel, no alteration to the barrel is necessary.
Installing a front sight on a threaded on collar is the hard way of doing it. It would have to have provision for indexing, as it is screwed into place.
Muzzle attachments certainly can affect barrel harmonics. They are often used to improve accuracy.
If you do decide to thread the muzzle, it should be properly done on a lathe by a 'smith who knows what is involved.

I figured I would index it using shimms against the flange.

banded sights eh that may be something to look into.

WHO in Edmonton knows what is involved?