How are you folks testing your bedding for stress?
You need a dial indicator and a magnetic base. Attach the magnetic base to the receiver and the dial indicator on the top of the stock. Loosen the front action screw, there should be zero movement of the dial indicator. (You can also set this up on the barrel with the indicator touching the stock ). Next do the same for the rear action screw. Sometimes I see very little movement here if the barrel is real heavy, then I'll bed the first inch or two of the barrel to relieve some of the weight.
It is simply amazing what a good bedding job will do to a rifle that has that "one flyer syndrome" ...or worse, "the two group syndrome" (two shots into one hole and three into another hole a 3/8" away........
Three "B"s....Bullets-Barrels-Bedding.........You simply can't have accuracy without all three.........Period!
If you see movement, your bedding is compromised or the screws are torqued too tight and you are distorting the bedding. It's all about the screws. This is why the BR guys do glue ins and don't use the screws.
The biggest mistake I see time and again when I read about folks bedding rifles, is too much pressure pushing the action into the wet bedding compound. If the electrical tape or surgical tubing is too tight, it will ruin a possible good outcome.
Most good accuracy smiths will not use the action screws to secure the action or align the action in the stock while bedding. It is nearly impossible to get a good stress free job with this technic. Plus, it's real messy and there are much easier methods using headless alignment screws.
I use oversized, headless bolts that fit tightly into holes that are bored into the pillars I make. The holes bored into the rifle stock for the pillars have lots of room around them for movement and for substantial amount of epoxy.
The holes in your pillars must be approx 1/32 to 1/16" larger in diameter than your stock bolts. You do not want the stock screws to touch the sides of the pillars.
My pillars are chamfered 45 degrees and my bolt heads are the same. This centers the bolt in the pillar once everything is dry and the rifle is reassembled.
More Here:
http://public.fotki.com/Rbertalotto/gunsmithing-reloading/
Hope this helps!