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?To nut or not to nut?

 
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  #64  
Old 09-24-2010, 06:46 PM
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Re: ?To nut or not to nut?

Quote:
Originally Posted by Coyboy View Post
Well let me throw in somthing to think about! Not that this post hasen't made us think of plenty already.

I have been workin on a nutted remington reciever. Not conventional in any sence of the savage nut.

The remmy action has no internal threads(bored out) but external threads 20 tpi. the barrel has no threads but will be machined for a tight slip fit into the reciever. Along with the bolt nose counterbore it will also need a counterbore to accept the lugs, as the barrel "tennon" will actually extend back to the reciever lug abutments. The barrel will have a shoulder that mates to the reciever face and a mating nut that is slid over the barrel and tightened to the reciever. This nut also acts as the recoil lug with a double shoulder.

This required adding a new scope base hole in the front reciever ring as the nut covers the front one up.

Kind of ar-15 style barrel fitting but no seperate thread extension.

Allows barrel indexing 360 degrees with the twist of a nut, and no headspace changes. Multiple barrels can be fit to the reciever and swapped out quickly. The 3 "rings of steel" just turned into 4.

Nate has seen this one off creation when he timed and tigged a new handle on, When customers work gets caught up I will get this thing barreled up for a short range f-class rig in 6br for next season.

This will likly only be a one of it's kind as it was somthing to satisfy my curiosity and help me sleep better at night!
Jim,
Sure would like to see some pictures, it sounds interesting. Do you really think it's going to help you sleep at night or just give you more things to think about?
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  #65  
Old 09-24-2010, 07:08 PM
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Re: ?To nut or not to nut?

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Originally Posted by phorwath View Post
Interesting. All the threads do is keep the barrel shoulder tight to the receiver face.

If that 'machined... tight slip fit' of the mating surfaces of the barrel tenon into the receiver is snug enough, long enough, and strong enough (supported with enough steel in the thickness of the surrounding receiver), I suspect it will be a shooter.

Having the bolt lugs lock into the barrel rather than the receiver could be beneficial to accuracy. Again provided there's enough mass of steel where the bolt lugs engage the barrel to endure the stress of repeated fire and use.

One question. Is the hardness of the steel used in barrels equal to the hardness of the steel used in the manufacture of bolts and receivers? I don't know the answer to that, but one of you gunsmiths will. If barrel steel is softer than receiver steel, then the bolt lugs might set back the barrel steel under recoil - where the bolt lugs make contact with the barrel.

You ought to post some pics!
The lug abutments of the reciever are still in use the actual barrel steel will be capable of bumping up against them, weater I bump the lugs or not is another experiment in itself. I have thought about that extensivly and will likly leave a .002 clearance from abutments to barrel.
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  #66  
Old 09-24-2010, 07:12 PM
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Re: ?To nut or not to nut?

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Originally Posted by James H View Post
Jim,
Sure would like to see some pictures, it sounds interesting. Do you really think it's going to help you sleep at night or just give you more things to think about?
James, I am not sure? I was thinking about this for a few months and one night it kept me up. The next day I pulled a new sps off the shelf and bored the threads out of it, made a nut and threaded the OD. The barrel I am using is CM and I had Brux contour it to save a bit on my machine time with the shoulder and such. It showed up a couple weeks ago. If I wasn't in the fall "rush" I would barrel it tommorow.
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  #67  
Old 09-24-2010, 08:55 PM
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Re: ?To nut or not to nut?

Jim,
Sorry I thought you had the project finished, now you're going to keep me awake at night.
I see no reason this won't work and am wondering why it hasn't been tried before. Maybe it has and just havn't heard of it.
Did you happen to cut an angle to the barrel seat in the receiver. It seems to me that would ensure that the tenon had no oppertunity to move at all since there needs to be some kind of clearence to fit the barrel into the receiver unless it is a press fit. It sure is a simple way to play with effects of barrel indexing.
Good luck with the project and please keep us posted.

James
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  #68  
Old 09-24-2010, 10:09 PM
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Re: ?To nut or not to nut?

phorwath, Remington and Weatherby MK V bolts are harder than the barrels. I haven't tested the receivers, but my impression is that they are in between the bolts and barrels in hardness. Good question, particularly in the case of bolt lock-up in the barrel instead of the receiver.

Jim, the separate barrel extensions on the AR's also seem to be harder than the barrels. Question: does one of the recent Remington factory rifles have the lock-up in the breech of the barrel? I haven't seen one, so I don't know if or how they did it, but I do know that the AR system works very well, so why not?

Tom
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  #69  
Old 09-24-2010, 10:31 PM
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Re: ?To nut or not to nut?

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Originally Posted by specweldtom View Post
phorwath, Remington and Weatherby MK V bolts are harder than the barrels. I haven't tested the receivers, but my impression is that they are in between the bolts and barrels in hardness. Good question, particularly in the case of bolt lock-up in the barrel instead of the receiver.

Jim, the separate barrel extensions on the AR's also seem to be harder than the barrels. Question: does one of the recent Remington factory rifles have the lock-up in the breech of the barrel? I haven't seen one, so I don't know if or how they did it, but I do know that the AR system works very well, so why not?

Tom
Not sure how the new remington modular system works. Machining lug abutments into the barrel breach was never in the cards for this particular test. I seen it more as a way to prevent threading the barrel all together.
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