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Old 06-28-2005, 05:35 PM   #1
 
Join Date: Jun 2005
Posts: 18
Forend Tension

I am preparing to rebed my SA M1A. I used Scott Duff's book as a guide for the initial bedding. In Duff's book, 8-12 lbs of tension was recommended in the forend. I have never seen Jerry Kuhnhausen's book, and I was curious if he recommends the same amount of tension I have handled a SA NM before, and it felt as if they used more than that . My rifle started out as a loaded standard. Thank you for your help, Boats 44
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Old 06-28-2005, 07:23 PM   #2
 
Join Date: Aug 2002
Posts: 3,362
I don't know the actual pound pressure, but there is a proper tension. I know it by feel

It should flex under hand tension, but not easily.

Sorry for not being much help, at least quantifiable help.
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Old 06-29-2005, 05:01 AM   #3
 
Join Date: Dec 2002
Posts: 3,224
I don't think you are likely to get too much tension on it by bedding the stock and even if you did it would be a bad thing.

I am like Bravo. I can tell if it is about right by "feel".
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Old 06-29-2005, 08:19 AM   #4
 
Join Date: Aug 2004
Posts: 23
I believe Kuenhausen just states that he's seen 'em bedded at X lbs. or whatever. I don't remember a specific # that he states as being "best". I could be wrong. (Often am).
My original bed-job came out to 44 lbs. measured at the forearm. Subsequent beddings came out lower and I believe my heavily-mod'd Sproingfeld standard is now at 20 some odd lbs.
Shoots VERY well.

Can't see any reason to go real heavy, but like my old buddy Bravo says, you'll get to know by the "feel".

Your mileage may vary.
Worth about 2 cents- if that much.
I could be wrong.
Not responsible for YOUR gunsmithing outcomes.

Spud
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Old 06-29-2005, 09:57 AM   #5
 
Join Date: Aug 2002
Posts: 3,362
Good to see you again Spud!

Was talking about you a bit ago with the kittywhacker. When we "share" (HA!) with eachother about "father problems", your name often comes up in context with major respect. No doubt!

And now for the "good stuff". On the bedding / forearm tension:

Bedding is a must for top accuracy. To get the tension right, often on the heavier stocks (McMillan M1A, M3A), you've got to relieve some material from inside the channel.

This does double duty in that now it clears the gas cylinder just a bit better.

The front end, at the ferule, should take some pressure to raise, but not "excessive" pressure. Like being able to squeeze it in one hand, and flex it.

Too little pressure (too floppy), you get problems from it either not providing repeatable tension on the ferule when using things for support, or in extreme cases (like when you're really pushing into the bipod on a down-hill shot, etc) you can bottom it out on the gas system. It won't make the action fail or anything, but you get wacky shots.

Too much and it seems accuracy starts slipping away. Why? I don't know. My GUESS (note: GUESS) is that it may have something to do with harmonics, and the "pull" on the front ferule.

Speaking of ferules, some folks debate with me about bedding it. They claim that it's enough just to drive it on and go. If it's a tight fit, logically, I can't give any real reason why that won't work.

As for me, I believe in bedding them onto the stock. No release agent obviously.......

Can I say my way is BETTER than that? Not honestly. What I can say is that it gives me confidence in my equipment, and this long range stuff is mostly voodoo and headgames anyway I'll take anything short of a beheaded chicken to help, if it really does.
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Old 06-29-2005, 11:26 AM   #6
 
Join Date: Oct 2002
Posts: 409
The National Guard MTU specified seven pounds on their NM rifles. I found that most rifles would shoot OK with a little more, but it's not a good idea to over do it. All it is supposed to do is stabilize the barrel, not bend it. I use three different bedding jigs depending on the stiffness of the stock and barrel weight. The heavier barrels and stiffer stocks don't require as much displacement as the lighter ones to get the same pressure.
Ted Brown is offline  
Old 06-29-2005, 11:30 AM   #7
 
Join Date: Aug 2004
Posts: 23
Bravo does it again!
My experience validates his.
Another thing on that ferruke and front band. Make sure that the front band lip and ferrule interface is smooth and even. Polished and mated would be a better way of describing it. Then a dollop o' grease between the two before you assemble stock to action to keep the gritty stuff out and there she is.

Bravo, I PM'd ya.
Adopted another little boy.
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Old 06-29-2005, 11:36 AM   #8
 
Join Date: Aug 2004
Posts: 23
Good to know Mr. Brown. Thanks.

Boats, in case ya didn't know, Mr. Brown is one helluva M-14 Armorer from what I understand.

Me, I just experiment...

PMing you again Bravo.

Spud
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Old 06-29-2005, 08:56 PM   #9
 
Join Date: Jun 2005
Posts: 18
Forend Tension

I appreciate all the information. I understand, not to over-do it, with too much tension. I prepared everything for rebedding today, so I'll start, first thing tomorrow. Thanks again, Boats 44
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