Posted: 8/25/2016 11:56:07 PM EDT
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I have a Winchester M70 in 300 H&H with a thin profile barrel. I would like to have it eventually threaded for a suppressor and since it has a .552" muzzle the only option is a 1/2x28 thread which will only leave a .026" shoulder. I understand I would need to put a bushing on the muzzle but there is another issue. When one puts a 1/2 thread on a .30 barrel is there enough meat left in the barrel walls after threading to hold up and not develop problems with stretching or anything else?
I'm starting to feel that it would be impractical to thread this barrel. |
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should be ok, there really isn't much force against st the shoulder it's more to give the attachment (suppressor, brake etc) a square point to tighten against. AAC specs a minimum barrel thickness of .675 for a 5/8-24 attachment, so that's only a .025 shoulder. Shouldn't require any bushing at all.
http://www.advanced-armament.com/assets/images/pdf/manuals/ThreadGuideREV_01-040513.PDF |
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That is a lot of gun behind little material though, A lot of force goes onto the can.. (look up that caliber) but I assume the PSI is pretty massive. I have seen 300 win cans fly 80 yards down range because people have used thread converters on skinny barrels. Any chance you would be willing to cut the barrel back to get some more material?
Not to scare you, and if you were asking about other smaller calibers I wouldn't have mentioned it. |
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I would not advocate that thin of a barrel for a can.
1-You will have a very thin threaded spigot as mentioned, no shoulder for the can to register on as well. 2-I would feel POI shift will be an issue, that's a good bit of weight hanging on a slender tube. 3-Barrel undulation could contribute to a strike. |
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Quoted:
I have a Winchester M70 in 300 H&H with a thin profile barrel. I would like to have it eventually threaded for a suppressor and since it has a .552" muzzle the only option is a 1/2x28 thread which will only leave a .026" shoulder. You end up with a 0.0838 wall thickness between the bottom of the threads and the crest of the grove. |
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Quoted:
You end up with a 0.0838 wall thickness between the bottom of the threads and the crest of the grove. 1/2x28 Class lll thread minor diameter is .4562. Bore diameter on a new 300H&H is .308. .4562-.308=.1482/2= .0741. That sure doesn't leave much to support a 30 caliber can let alone virtually no shoulder to register on. |
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If the barrel profile is close enough to concentric with the bore already, you might get by with 9/16" or 14mm thread for more meat.
You would probably need to make or modify an adapter (likely for an AK) to index on the muzzle instead of the (non-existent) shoulder. It's been done before. |