coyota1, a piece of flat rubber under the barrel about two inches from the end of the fore stock to improve accuracy does not indicate a barrel issue. That means the receiver's not held repeatedly in the stock at its location; something's a poor fit or loose. All that rubber spacer does is half-way corrects the stock's problem of not holding the receiver the same for each shot.
If the receiver's held firmly in place for each shot and the barrel's not touching anything, that barrel will whip, wiggle, vibrate or whatever exactly the same for each and every shot before the bullet leaves it.
reynolds357's issue with his stock in the receiver area is a good example. Same thing happened decades ago with the first synthetic stocks. Their material in the receiver area was too soft for proper stock screw torquing so someone came up with the idea to put big pillars around the stock screws so the stock core wouldn't compress too much.
Regarding Erno86's comments of which screw to torque in first, I don't think it matters as long as you start in each screw until you start to feel it tighten, then do all the others to the same place, then finally torque each one up. Not enough stock screw torque will cause vertical shot stringing; the barreled action whips too much and not the same amount for each shot vertically from shot to shot. That's the details behind reynolds357's issue.
US Navy Distinguished Marksman Badge 153
Former USA Palma Team Member
NRA High Power Long Range High Master
NRA Smallbore Prone Master
Last edited by Bart B.; January 22, 2013 at 08:36 PM.