Thread: Rebore.

Is there any one in New Zealand, that does rebore on a barrel, and does anyone have an idea of cost.
Considering getting a K95 barrel rebored to .308 or .358 win.
Not enthused with the .243 barrel, and would like sum thing, that can be shorten and suppressed.
Have 6.5 & 5.6 Barrels, so can cover the .243 ground with them.

I am sure Hardy or truefligh are options, just not sure if they will another’s barrel.
If you have done so please pass on info.

You can only reborn an existing barrel with the cut rifling method
Not aware of anyone doing it in NZ

There are a number of businesses in the USA who do is and a very reasonable price
358 is a good option and seems too be a common option

35.com sort of says what you want too hear

Home - Reboring by J E S

I havecan artical in a book somewhere on reboring and it lists about 10 USA companies that do it.

If I can find it I will post the list.

From memory the only fly in the ointment was waiting times.
Some were only a month or two, others had a massive backlog

While there are barrel makers in NZ, they are all button rifle barrel makers
Rifling buttons can only go through a barrel blank that is virgin steel of a constant diameter

While a button could go through I pre existing profiled barrel it would give a bore that kept changing diameter due to the inconsistent steel thickness

Cut rifling an existing barrel is the only option

Spent some time with the boys from Oregunsmithing a few years back, pretty sure they were set up for cut rifling. Oregon is a lot closer to Bell Block than NZ, might be worth trying to get hold of them.

Well it should be cheaper.
Not paying for the barrel blank and already has a hole down it.

My understanding is that any existing caliber needs to be bored out first. This brings it back to a blank stock and then a button can be drawn through this. So a 243 barrel will need to be bored out to a new hole of say 249 & then rebore to a minimum 257. The grooves are usually 0.004 inch for a total caliber of 0.008 more than the original bore diameter. (For example 308 has a 300 bore & 7mm = 284 with a 276 bore.)

The late Din Collings once told me that a well used barrel would have a better molecular structure for reboring.

The theory behind that being all that rapid pressuring and releasing caused by firing will have tempered and distressed the barrel.

Originally Posted by Nakihunter

My understanding is that any existing caliber needs to be bored out first. This brings it back to a blank stock and then a button can be drawn through this. So a 243 barrel will need to be bored out to a new hole of say 249 & then rebore to a minimum 257. The grooves are usually 0.004 inch for a total caliber of 0.008 more than the original bore diameter. (For example 308 has a 300 bore & 7mm = 284 with a 276 bore.)

The late Din Collings once told me that a well used barrel would have a better molecular structure for reboring.

Nice idea
But wrong

Yes the steel is stress relieved by thousands of shots
And yes you can put a button through and correctly sized piece of steel
But you can NOT put it through and existing profiled barrel and get a usable barrel

Buttons are not pulled through a bore diameter drilled barrel blank
They are made especially for being pulled through a certain fixed diameter of steel
The drilled and reamed hole they go through is slightly smaller than final bore diameter
This allows the button which is actually larger that the final bore and groove to be pulled through and the known diameter and known type of steel too spring back to final bore and groove

The variable spring back on an existing profiled, bored and reamed barrel means that pulling a button through it would give a significant variation in the final bore and groove sizes.
The muzzle which is usually the thinnest section of the barrel would be bell mouthed, because it is thinnest there is less metal too spring it back.

Originally Posted by akaroa1

The variable spring back on an existing profiled, bored and reamed barrel means that pulling a button through it would give a significant variation in the final bore and groove sizes.
The muzzle which is usually the thinnest section of the barrel would be bell mouthed, because it is thinnest there is less metal too spring it back.

Pull it through backwards then - problem solved!

Look for solutions, not problems.

Might be sarcasm, might not....

Originally Posted by Ross Nolan

Pull it through backwards then - problem solved!

Look for solutions, not problems.

Might be sarcasm, might not....

I believe that's called Pushing.

Originally Posted by whanahuia

I believe that's called Pushing.

Potato, potatoe, semantics.

I believe JES are the go to, but I don't know how easy it would be to do the trans border thing with gun parts.

Originally Posted by Ross Nolan

Pull it through backwards then - problem solved!

Look for solutions, not problems.

Might be sarcasm, might not....

Same difference
Won't work