Which bolt action rimfire is best designed for rebarreling?

[DShortt]

With the barrel there is nothing to be set. Barrel maker does his thing however he does it with whatever reamers he uses. You take off the factory barrel. You put on the new one. Done. Go shoot. You have nothing to set. Go shoot.

This makes -0- sense to me. I have chambered and fitted numerous centerfire barrels. It's rare to be able to pull one and fit another prefit on all but a few custom actions. Barrel nuts are the exception. So pardon my confusion, but I don't understand how this works.

 

[jpjulian]

I can't help you. Maybe someone else can but I cannot.

 

[Sniperhandle]

This makes -0- sense to me. I have chambered and fitted numerous centerfire barrels. It's rare to be able to pull one and fit another prefit on all but a few custom actions. Barrel nuts are the exception. So pardon my confusion, but I don't understand how this works.

Ruger 10-22 Barrels have the headspace set by the mfg, You as the consumer have no way of setting headspace, Same scenario is what the previous poster is saying. If you machine your own barrel, That's another story. But if you had one in your possession that would be easy to figure out.

 

[Tad_Earhart]

The CZ 457 as stated above is a slip fit tennon with 2 set screws retaining the barrel in place. These set screws are on an angle in the action and bare against angle cuts in the bottom half of the tennon. HS is set via shims either between action face and barrel shoulder or between bolt lug set and shoulder of bolt or a combination of the two. If I was machining things to fit myself, there would be no shims used and everything measured out like normal slip fit type setups but for most just using a prefit, this is not a viable option for trying to achieve a particular HS number.

I am fairly sure that the 455 uses a similar type of attachment method but not exactly the same. I have not handled one to confirm this. I am pretty sure the 452 is actually a threaded tennon, 2 lug action. It seems more desirable to me to build something on the 452 but most people in factory type action world are looking for a simple and easy way to change barrels easily like the 10/22 has had for such a long time.

10/22 headspace is set via the bolt nose recess. Within reason, any tennon length will have the same HS on the 10/22 becase the bolt face will close up to touch the breech face of the barrel. The only way to change the HS there is to grind the bolt face down to what ever is desired. Concern for slam fires needs to be considered on trying to go too tight.

Tad

 

[DShortt]

The CZ 457 as stated above is a slip fit tennon with 2 set screws retaining the barrel in place. These set screws are on an angle in the action and bare against angle cuts in the bottom half of the tennon. HS is set via shims either between action face and barrel shoulder or between bolt lug set and shoulder of bolt or a combination of the two. If I was machining things to fit myself, there would be no shims used and everything measured out like normal slip fit type setups but for most just using a prefit, this is not a viable option for trying to achieve a particular HS number.

I am fairly sure that the 455 uses a similar type of attachment method but not exactly the same. I have not handled one to confirm this. I am pretty sure the 452 is actually a threaded tennon, 2 lug action. It seems more desirable to me to build something on the 452 but most people in factory type action world are looking for a simple and easy way to change barrels easily like the 10/22 has had for such a long time.

10/22 headspace is set via the bolt nose recess. Within reason, any tennon length will have the same HS on the 10/22 becase the bolt face will close up to touch the breech face of the barrel. The only way to change the HS there is to grind the bolt face down to what ever is desired. Concern for slam fires needs to be considered on trying to go too tight.

Tad

Thank you for those details. I appreciate it.

 

[CharlieNC]

So I'm confused...... how is the headspace set?

Tolerances are typically close enough, slide in and shoot. Shims are available to insert into the bolt if necessary, but rimfire headspace is not so picky for accuracy according to the expert Calfee.

 

[Will Henry]

Headspace is set the same as on a centerfire; the distance from the shoulder to the breech sets the headspace. If there is a counterbore for the rim, it is the distance from the shoulder to the bottom of the counterbore. This is to say, the headspace is set by these distances. The actual headspace measurement is from the boltface to the breech or the bottom of the rim recess, if there is one.
I always prefer a threaded receiver. The extractor cuts complicate things a little, especially if they are located somewhere other than 3 and 9 o'clock. All CZ's prior to the 455 are threaded. WH