Action mounting question?

K

kraayenb

Guest
I am in the process of building my first complete custom bench rifle and am building the stock from billet aluminum.
I here a lot of conversation on bedding and making the action ridged to prevent any movement, is there a possibility of mounting the action too ridged?
My own thoughts are that it could increase the harmonics going down the barrel but I intend to put interrupted fluting on the barrel and an adjustable 180˚ saddle lined with sorbathane about 10” from the action, the adjustability will allow me to vary the contact pressure.

kraayenb
 
When I was in the concept stage of design for the Metal Mayhem I decided that I wanted a floating bbl as this ALWAYS gives good results with the normal tapered bbl as required by 100/200 BR rules. Shelley's Tinker Toy was the inspiration but I had my own engineering ideals I wanted to apply. Brute strength was one of them. All the individual parts are robust and become stronger when bolted together to form the 2 subassembles. This is most likely the strongest, stiffest stock ever used on a legal 13.5 lb HV/VFS rifle.

If you are using a straight cylinder bbl profile then the bbl block system works fine.

http://benchrest.com/showthread.php?69545-Metal-Mayhem-30BR-Nearly-Done&highlight=
 
Kraayenb,

There are a few cans of worms associated with your post. My opinion would just be one of many and it is hard to say what is the right approach, but in general I think that it is not a problem to go for as much rigidity as possible in the bedding - meaning that you want consistently low flex of the action and (perhaps more importantly) consistently repeatable return to position of action/stock from shot to shot. The question arises that perhaps if the barreled action and metal stock vibrate at the wrong frequency some resonance might occur which is not the best for accuracy. Your comments about putting a Sorbothane pad against the barrel would only be to control or modify these same vibrations. The downside of that is that as the barrel heats up, the dimensions of your barrel will change, which causes the pressure of the pad to change, which causes (at best) vertical stringing. I have built tuners which move Delrin pads up and down the barrel in order to change the tune, but these really only work to improve hunting accuracy, not qualify them as benchrest guns. For a bench gun, rigid bedding, free floating ( with some vibration damping ?), a muzzle tuner, etc. might be the state of the art. Scott
 
shevelin
Thanks !! for the input. My thoughts for the sorbathane saddle were to be able to adjust from no contact to just touching with no real pressure.
I only wanted to interrupt the harmonics as they travel down the barrel.
I don’t exactly know how much harmonics affect accuracy because this is my first attempt at building a complete custom bench rifle and am trying to incorporate
everything I have learned and or read about .
Bill
 
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