PDA

View Full Version : winchester pre 64 breech bolt


steve19438
February 5, 2013, 02:47 PM
greetings,
i need a replacement breech bolt for my pre 64 model 70 in .243 cal.
i have tried many places and so far have been unsuccessful. i have hopes that some one from this board could help me.
thanks,
steve

Savage99
February 5, 2013, 11:40 PM
Welcome to the forum.

Why do you need a new bolt?

Do you have the bolt?

Bart B.
February 6, 2013, 08:01 PM
Do you want a complete bolt? I've got one.

James K
February 6, 2013, 09:01 PM
You could run into headspace problems installing a new bolt. If the headspace is short, that is easily solved with a .243 chambering reamer. But if it is excess, the barrel would have to be set back and with a pre-64 model that could create some problems with the stock bedding.

Jim

AR15barrels
February 6, 2013, 09:46 PM
You could run into headspace problems installing a new bolt. If the headspace is short, that is easily solved with a .243 chambering reamer. But if it is excess, the barrel would have to be set back and with a pre-64 model that could create some problems with the stock bedding

Also, setting back the barrel would require timing of the sights and re-cutting of the breech cone and the extractor cut.
All do-able, but still a lot of work...

Hopefully his replacement bolt is close enough to the original bolt in headspace dimension.

Bart B.
February 7, 2013, 08:19 AM
Setting back a pre '64 Win 70 barrel will not cause a stock bedding problem. If it's got the fore end screw to the lug under the rear sight, just remove it then relieve the stock for the barrel swell to clear. Free float the barrel and one's good to go.

Rechambering any barrel to gain a few thousandths headspace typically requires the old chamber to be completely cleaned out. That might require the barrel to be set back as the reamer's profile probably won't match the chamber's profile to start with and steps and ridges will be made where diameters are different. Replacing this one's bolt may only need its face to be squared up and set back a few thousandths if the headspace is too short.

And yes, the barrel tenon may need to be recut if the barrel's set back. Clocking in the barrel's easy if one puts witness marks on it and the receiver face before starting.

James K
February 7, 2013, 09:51 PM
Sorry I didn't go into all that detail; I just wanted to point out that the job might not be as simple as just sticking in a new bolt.

Jim

Pathfinder45
February 8, 2013, 12:19 AM
What happened to the original bolt? I bet a lot of bolts get misplaced by being stored separately for, "safety's-sake", and then lost over time.