Clamp on tuners -- how tight?

C

conrad

Guest
With these clamp on tuners how tight can/should they be to stay on and not effect accuracy? How is the best way to test for excessive tightness. If I slug after tightening I get a noticeable barrel restriction at about 30 in/lb on a Fudd.
 
Dumb question....why couldn't you glue on and adapter that hung over the muzzle just enough so that the tuner clamping forces were entirely off of the barrel?
 
I know little about this "stuff."

30 in. lbs is 2.49 ft pounds, which is compressing a cylindrical steel tube. :confused:

Does a "smaller" diameter at the muzzle improve accuracy, all else being equal ?

dwd
 
From my testing with my 2013, I found that 30in lbs did provide a significant restriction. I would clamp it on and tighten it to about 15 in lbs, there is a lot of clamping force there. Slug it and double check it.
 
I a tuner is correctly bored to a guage (snug) fit at the muzzle, 5 to 10 inch pounds of torque should be enough to keep it in place.
 
edgerat said:
From my testing with my 2013, I found that 30in lbs did provide a significant restriction. I would clamp it on and tighten it to about 15 in lbs, there is a lot of clamping force there. Slug it and double check it.
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That is what I found. 30 in/lb stops a lead slug just like it hit a wall.

At 10 in/lb the tuner scoots forward.This is a centerfire application. I thought you RF guys might know more about clamp-ons since the centerfire guys use screw-ons.

Thanks for the replies.
 
A good method, ala BC, is to tighten holding the short end of an allen wrench. Pretty hard to overtighten.
 
conrad said:
That is what I found. 30 in/lb stops a lead slug just like it hit a wall.

At 10 in/lb the tuner scoots forward.This is a centerfire application. I thought you RF guys might know more about clamp-ons since the centerfire guys use screw-ons.

Thanks for the replies.
Click to expand...

There's a reason why the c/f guys choose screw ons. I guess you've just found out what that reason is.
 
Here in Australia, many of the centrefire open range tuners are set up on threaded tubes that are glued to a parallel on the barrel with Loctite 243. Our tuners tend to be in the range of 2 to 6 ounces weight & I've never personally had any of mine breaking loose.
 
On RF, a gage fit and finger tight is sufficient. The biggest problem with excessive torque, is making the muzzle something other that perfectly round. If you like, dust the muzzle end, with some powdered rosin, before slipping the tuner on. This will also help grip the tuner. and less torque is needed. In CF, the recoils is so violent, that gluing is the best option such as the one that John from down-under is using.
 
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