should I thread a match barrel?

[supermanwp]

Hi everyone, I just bought an non threaded Lilja barrel for cz457.
I want to thread it and put a muzzle device on, however I am wondering if it may effect accuracy.
Do anyone have similar experience?
Thanks!

 

[scuba52]

Shouldn’t matter, threads being cut properly won’t touch the crown directly. There is an argument that a good brake will help accuracy by deflecting gasses away from the bullet as it leaves the muzzle

 

[TrxR]

There is a theory that threading the barrel can open up the bore slightly. There have been discussions about it over on accurate shooter forum.

 

[grauhanen]

Many shooters are concerned about threading affecting a barrel's accuracy because the turning down a muzzle or threading it can open up bore diameter, as noted by TrxR. A solution to this is to counterbore the muzzle.

At the same time it must be kept in mind that if the barrel as it is now is tightest at the muzzle -- so-called choking effect, which can be determined by slugging the barrel -- counterboring may partially or completely affect such a tight area. Ideally, a bullet should exit a barrel at its tightest point and as a result gunsmiths using custom .22LR barrel blanks will slug the blank to determine its tightest point and cut the muzzle there.

In any event, adding a threaded muzzle device rather than a tuner will not enhance accuracy except by the random chance that its weight and length will do exactly what a properly adjusted tuner will do. A tuner is adjustable and has a range of settings and will not improve accuracy simply by its presence or at arbitrary settings.

To get the best accuracy from your Lilja barrel, pillar and bed the rifle, and use the most consistent ammo you can find. Remember it's not the brand of ammo that gives best accuracy, it's matching a particular lot or lots of a brand of ammo to your rifle. A muzzle device will not improve accuracy except by chance and the odds are very, very long against it.

On the other hand, if an aesthetic appeal is the goal rather than best accuracy it doesn't matter if the muzzle is threaded.

 

[TrxR]

I do believe that tuners can enhance accuracy if adjusted right. I also believe there may be a reason that rimfire tuners are clamp on , not threaded.

 

[The ROC]

Hi everyone, I just bought an non threaded Lilja barrel for cz457.
I want to thread it and put a muzzle device on, however I am wondering if it may effect accuracy.
Do anyone have similar experience?
Thanks!

I've got the 16" threaded Lilja barrel on my 457. Whether I've attached a linear compensator, or just a regular thread protector or nothing at all I measured on average no difference in group size. However, I have discovered if the compensator or thread protector was not screwed on firmly, meaning the muzzle device can turn freely, then the groups opened up with a lot of flyers.

 

[bearhunter]

There is a lot of controversy over this, so you're likely going to have to make up your own mind.

I personally won't add a device to the end of a barrel, utilizing threads.

That's just me, I've seen rifles shoot very well with a muzzle device that acts as a brake to reduce muzzle jump.

If your barrel is a standard diameter for field use, the brake may be beneficial but it may also screw up harmonics, to the point finding ammo it likes is next to impossible.

I have seen such barrels completely change, when a threaded brake is screwed on tight enough so it won't loosen up under use.

I'm obviously not a fan of brakes, especially threaded brakes. I have one rifle with a brake and it's a 7x57 Mauser on a 98 action. It's silver soldered onto the barrel and is only a couple of thousandths of an inch over bored from the base, a few thou from the muzzle, to the Muzzle. This allows very little gas to move around the bullet, before it goes past the ports.

Most brakes have a huge cavity that the bullet has to travel through, with violent gasses going past it before entering the smaller exit hole at the end of the brake.

When I clean my rifle, the brake gets cleaned properly at the same time.

I won't tell you not to purchase and install a brake, some people just like the look for a cool factor. Just be prepared to find a brand of ammo the new harmonics will shoot well.

That being said, it may never be an issue and your new barrel won't even notice it's there.

 

[Shooter1971]

There is a theory that threading the barrel can open up the bore slightly. There have been discussions about it over on accurate shooter forum.

This is can occur if you take too much on each cut. If done properly should not be an issue. I have seen one open up like this. Measurable difference at the last 1/2 inch at muzzle