Opening A Boltface
When using an existing action for another, larger, caliber how does a gunsmith open the bolt face to accept the larger cartridge. Does the extractor also have to be reworked???
Thanks, 11thcanopy
Thanks, 11thcanopy
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Many gunsmiths perform this operation on a lathe, using a specially cut lathe bit to open the bolt face. I do it on a milling machine with the bolt clamped vertically and using a 4-flute end mill of the appropriate size. As to whether or not the extractor must be altered--this depends on what to what the caliber change is. Often it is unnecessary, but when changing from (for example) a bolt face designed for 8x57mm to .300 Win. Mag. it is usually necessary to file down the extractor hook somewhat, while pretty much retaining the same shape. 0 -
11th,
What rifle is this for? It makes a difference.
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First of all, thanks guys for your replys.
Should have given more information regarding what I am interested in.
I want to think about converting an existing bolt action rifle or one of the Remington Fireball type pistols to 10 MM Mag. Is there an existing rifle that would work or one of the Remington Pistols??
Figured that because of cartridge length the magazine well would be a problem also reboring the barrel.
Thought opening up a smaller caliber to 10mm would give a companion to our Glock 20.
Just a sort of "wonder if I can do that" thought.
Again I certainly appreciate your thoughts and information.
11thcanopy0 -
Another thought 11th, is that there were several companies that made 10mm auto's. The TC line for instance has enough metal left that you could enlarge the chamber to 10mm mag configuration. There are companies too that sell CCU (carbine conversion units) for your Glock 20, as well as others that do (or at least have) made 10mm carbines based on the M1 or AR lines.
The 10mm - either you've got it, or you don't get it...0
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