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Started By
Message
Building a 10mm single rifle
Posted on 7/22/17 at 8:27 pm
Posted on 7/22/17 at 8:27 pm
I've had this idea for a few months. I have an old Winchester model 37a single shot shotgun back home.
Pic of one similar in 12 ga
I found a source where I can get 10mm 1x20" barrel stock for $44 online. I'm pretty sure the 37a barrel is right under 1" in diameter.
I would then go to a local machine shop and get the barrel turned down to match the 20 ga in diameter and cut it 16" long. Then get the two lock attachments for the barrel cut out and welded on. Would not worry about building an extractor
Theoretically since both primers sit in the center of each barrel, if the outside barrel diameters match at the locking point for the receiver and forearm this should work right? This would be a cool project to make a handy woods gun in one of my favorite calibers, 10mm.
Since the barrel would be pretty thick, machining on a scope mount for a little 1-4x scope would be viable.
Pic of one similar in 12 ga
I found a source where I can get 10mm 1x20" barrel stock for $44 online. I'm pretty sure the 37a barrel is right under 1" in diameter.
I would then go to a local machine shop and get the barrel turned down to match the 20 ga in diameter and cut it 16" long. Then get the two lock attachments for the barrel cut out and welded on. Would not worry about building an extractor
Theoretically since both primers sit in the center of each barrel, if the outside barrel diameters match at the locking point for the receiver and forearm this should work right? This would be a cool project to make a handy woods gun in one of my favorite calibers, 10mm.
Since the barrel would be pretty thick, machining on a scope mount for a little 1-4x scope would be viable.
2
Posted on 7/22/17 at 8:55 pm to texag7
How would you handle the extractor? Would you have the machine shop attach the parts to the barrel?
Why not find a really good gunsmith?
What does the 10mm barrel fit? Is it just a straight rifled barrel in 10mm no taper on the outside?
Why not find a really good gunsmith?
What does the 10mm barrel fit? Is it just a straight rifled barrel in 10mm no taper on the outside?
Posted on 7/22/17 at 9:03 pm to bbvdd
I wouldn't put an extractor on it. Too complicated when I could just add a small notch and pull the spent cartridges out by fingernail.
Because they would charge a bunch for a fairly straightforward design
quote:
Why not find a really good gunsmith?
Because they would charge a bunch for a fairly straightforward design
Posted on 7/22/17 at 10:38 pm to texag7
Disclaimer: I am neither a gunsmith nor a machinist. I am an experienced handloader and shooter, especially of T/C Contenders. I'm assuming your project is using a 10mm Auto barrel.
My main concern here would be whether your proposed project is safe. I think an experienced gunsmith would be more than likely your best evaluator of that aspect. I don't have an Ithaca Model 37s, but from your pic it looks like a closed breech type action. I've shot Contenders a lot over the years. They too are a closed breech action. The average shotgun SAAMI (industry standard) pressures vary from 11.500 to 14,000 psi. The 10 mm Auto SAAMI pressure is 37,500 psi, nearly 3X more than hottest shotgun pressures. If the chamber pressures are more than the frame is designed to handle, the gun's frame will be damaged and will stretch. Blowing up the barrel is less likely until one reaches very excessive pressures. This is why T/C developed the Encore. The Contender frame was not robust enough to handle higher pressure rounds like the 308, 30-06, 270, 243, etc.
What kind of pressures can the 37s safely tolerate w/o suffering damage or becoming unsafe? I don't know the answer to that, but I think you need to find out.
quote:
Why not find a really good gunsmith?
Because they would charge a bunch for a fairly straightforward design
My main concern here would be whether your proposed project is safe. I think an experienced gunsmith would be more than likely your best evaluator of that aspect. I don't have an Ithaca Model 37s, but from your pic it looks like a closed breech type action. I've shot Contenders a lot over the years. They too are a closed breech action. The average shotgun SAAMI (industry standard) pressures vary from 11.500 to 14,000 psi. The 10 mm Auto SAAMI pressure is 37,500 psi, nearly 3X more than hottest shotgun pressures. If the chamber pressures are more than the frame is designed to handle, the gun's frame will be damaged and will stretch. Blowing up the barrel is less likely until one reaches very excessive pressures. This is why T/C developed the Encore. The Contender frame was not robust enough to handle higher pressure rounds like the 308, 30-06, 270, 243, etc.
What kind of pressures can the 37s safely tolerate w/o suffering damage or becoming unsafe? I don't know the answer to that, but I think you need to find out.
Posted on 7/22/17 at 11:49 pm to texag7
Why not just buy a H&R handi-rifle in .500 S&W Mag , or order a 10mm (.400) barrel liner and have it professionally installed ?
Posted on 7/23/17 at 8:34 am to Got Blaze
I'm curious and I know you said you just like the cartridge, but what's the benefit of that over just a 20 gauge slug? Seems like a lot of money to spend for something that wouldn't have a large return over a shotgun slug?
Posted on 7/23/17 at 2:02 pm to texag7
I love it when I hear of another man trying to throw money up a wild hogs arse. These type projects proves America is the greatest country on earth.
Posted on 7/23/17 at 2:08 pm to texag7
quote:
I wouldn't put an extractor on it. Too complicated when I could just add a small notch and pull the spent cartridges out by fingernail.
Know that the 10mm Auto is a rimless design so it wouldn't be as easy as pulling a spent shotgun shell or 22 out of the chamber.
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