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22lr to 22 mag?

bait dunker
I recently picked up an Interarms singleshot "survival" rifle at a garage sale. The lady thought it was a toy, so 5 dollars later and it was mine. Ive seen these in 22 mag, this one is in 22lr. So I got to wondering if I were to drill out the chamber to .240 (I measured several 22 mag cartridges and all measured .238), a #73 drill bit, could I shoot 22 magnum cartridges out of it? Any ideas?
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6 comments

Date Votes
  • tsr1965
    Don't do it. We have had several post on this subject as of late. The 22LR bullet and corresponding bore diameter is smaller that that of the 22WMR. Also, a chamber is a delicate thing with more detail than just sticking a drill in and hoping for the best. They are cut with a reamer, and if I am not mistaken, the 22WMR chamber is slightly tapered. The chamber also has a leade and throat to kind of like funnel the bullet into the rifling. Lastly I am not sure as to what type of rifle it is withoout pictures, as to be able to assess if the reciever/action would be strong enough to handle it. It is best to be on the safe side.

    Best
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  • rufe-snow
    If it's in descent shape these "Bronco" type rifles are getting collectable. You might have the opportunity to make some money out of it, if you don't screw it up. Check out what they are going for on the auction, before trying to rechamber it.
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  • bait dunker
    Thanks for the info. It was just an idea. I did misspeak, its not an interarms, but a firearms intl.
    http://www.gunbroker.com/Auction/ViewItem.asp?Item=121301790
    just like this one. Ive seen them in 22, 22mag and .410, but know nothing about the rifle at all, other than its more of a novelty than a real gun.
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  • perry shooter
    Some parts of these are POT METAL and prone to cracking from some types of oil reacting with this type of metal. I would sell at a profit and get a 22 mag rifle.
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  • beantownshootah
    Probably not safe to do the conversion.

    Agreed that you're better off selling it (or just trading it) for a .22 magnum, if that's the caliber you want.
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  • Fatstrat
    Not only is the bore/chamber larger than the .22LR. But the rim on the cartride case.
    Rechambering is the EASY part. Opening up the bolt face to work on a .22 Mag is the tricky part of a conversion. Screw it up and you're now looking for replacement parts. Which in this case are likely going to be hard to find.
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