Boyd Allen
Active member
My Sporter (10.5# PPC) is built on a Viper action, which is glued into a Lee Six mfg. SG&Y Millennium stock. I do most of my shooting at the Visalia range. It runs slightly downhill from the firing line to the targets, although I am not sure how much, or if this is compensated for by the height of the target frame at 100 yd.
In any case, the problem that I am considering is that I can feel the butt stock jump out of the ears of the rear bag pretty much every time that I fire the rifle. The stock is not "wedged" in the ears, so I don’t think that that is the source of the problem. I do notice that the CG of the rifle is high. There is a weight system in the butt for balance that is bolted to the inside of aluminum butt plate. The barrels are 21-22 inches long.
I have been thinking that there may be several things interacting to cause this. Shooting downhill may have the thrust line of the barrels rocket effect on firing directed up and away from the rear bag. The high CG of the rifle may be above the thrust line, causing the rifle to rotate down at the front and up at the back. The angle of the bag-riding surface at the front of the stock in combination with the polar momentum of the weight in front of the front bag may contribute to the rifle's rotation. I don't really know how this works, but it is clear that the nature of the various geometric and inertial properties are causing something to happen that would not be seen by simply sliding the rifle in the bags without firing it.
My first thought was to add weight to the butt, but I am at the limit, and I still have the problem. My next approach may be to temporarily attach a piece that allows me to change the angle at the front of the stock to something that is closer to parallel to the bore.
Have any of you run into this, and if you were able to fix it, how did you? I shoot free recoil the majority of the time, and I will be trying to work with solutions that allow me to continue with this style.
Or, perchance, is it not a problem, and therefore does not need to be fixed?
In any case, the problem that I am considering is that I can feel the butt stock jump out of the ears of the rear bag pretty much every time that I fire the rifle. The stock is not "wedged" in the ears, so I don’t think that that is the source of the problem. I do notice that the CG of the rifle is high. There is a weight system in the butt for balance that is bolted to the inside of aluminum butt plate. The barrels are 21-22 inches long.
I have been thinking that there may be several things interacting to cause this. Shooting downhill may have the thrust line of the barrels rocket effect on firing directed up and away from the rear bag. The high CG of the rifle may be above the thrust line, causing the rifle to rotate down at the front and up at the back. The angle of the bag-riding surface at the front of the stock in combination with the polar momentum of the weight in front of the front bag may contribute to the rifle's rotation. I don't really know how this works, but it is clear that the nature of the various geometric and inertial properties are causing something to happen that would not be seen by simply sliding the rifle in the bags without firing it.
My first thought was to add weight to the butt, but I am at the limit, and I still have the problem. My next approach may be to temporarily attach a piece that allows me to change the angle at the front of the stock to something that is closer to parallel to the bore.
Have any of you run into this, and if you were able to fix it, how did you? I shoot free recoil the majority of the time, and I will be trying to work with solutions that allow me to continue with this style.
Or, perchance, is it not a problem, and therefore does not need to be fixed?
