.243 re-bore

[Mescalero]

I have a Tradewinds 1500 .243 ( Husqvarna ).
I would like to re-bore to .260 Rem.
You guys think there is enough barrel to handle opening it up?

[6pt-sika]

Everything I've read about reboring claims you need about .040". The 243 to 260 would be .021" .

[Mescalero]

l should have asked the question in inverse order.
As in is there enough barrel?

[El Chivo]

I'm sure there will be enough barrel, as the new bore is only 1/2mm larger than the old one - 6mm to 6.5mm. Only 1/4mm will be removed from each side. However, this may not be enough to wipe out the old lands and create new lands. New lands will have to start where the old groove left off.

According to the JES Rebore site, the difference between land and groove is about .010" and you need this on each side, and you only have .021" to play with.

How about going out to .308?

[Mescalero]

I would rather not.

[BrianSH]

Fast forward to the future. Let us start with where we're gonna end up - 7-08.

[Model 52B]

Rebarrelling an action based on the '98 Mauser isn't complicated. I'd just get a new barrel blank in the caliber you want, then have it turned to the same profile as your original and call it good.

It will be cheaper in the end and won't have all the problems inherent in re boring or re lining a barrel.

[Mescalero]

Thats the way I'll go.
Probably be close to the same cost.

[Pete44ru]

I'm sure there will be enough barrel, as the new bore is only 1/2mm larger than the old one - 6mm to 6.5mm.
Only 1/4mm will be removed from each side.
However, this may not be enough to wipe out the old lands and create new lands.

According to the JES Rebore site, the difference between land and groove is about .010" and you need this on each side, and you only have .021" to play with.

The rebore boundaries are:

* A minimum barrel wall thickness of .125" @ the muzzle, after a rebore.

* A minimum rebore of at least .025" from the previous size to obliterate the previous rifling.


That usually means going "up" two bore sizes to beat the .025" minimum - like from .243" to .277"/.284" (6mm to 7mm) - while still keeping within the minimum finish bbl wall thickness @ the muzzle.

For instance, while a rebore of my .30-06 Winchester M70 Featherweight to .358 Whelan could easily beat the minimum rebore size, nobody would do it, because the FW's bbl contour would leave the bbl too thin @ the muzzle. The FW's bbl OD @ the muzzle was .500", but the rebore to .358" would need a minimum muzzle OD of just over .600". (.358" + .125" + .125" = 608" )

Ergo a rebore from .243" would need to go up to at least .277", but most likely to .284"/7mm on a short action - + .125" + .125", resulting in a minimum muzzle OD of .530" or .535" .


That means that, if a cartridge upgrade from .243 Winchester to the .260 Remington is the target, a rebarrel would be indicated.



.

[6pt-sika]

Thats the way I'll go.
Probably be close to the same cost.

There are three or four fellows who have websites for reboring other then JES . And all of those I read suggested .040" .

They also all charged about $200-400 for a rebore and they do not guarantee that the barrel will not be ruined .

I just did the rebarrel on my 700 the charge for the Shilen carbon steel barrel was about $180 dealer cost , already had a chamber reamer but you can rent one for about $40 I think . So theoretically you oughtta be able to rebarrel for less with a little luck .

[piller]

Keep us informed of the progress. I don't have anything to add, but I am curious as to how it will turn out.

[3leggedturtle]

Mescy: If your gonna rebarrel why not 25-308 AKA 25 Souper. I am thinking you want to shoot and plink rocks at long range. The 6.5 bullet are very streamlined and hold up well out to 1000 yards. BTW I have always wanted a 5.7MMJ or .22 Carbine in a small lightweight single shot or bolt rifle, but have always went to 22 Hornets. ( 5 times )

[Mescalero]

One of my friends has a Springfield 03 that has been cut in half, shortened and put back together.
It is chambered in 5.7 mm Johnson.