I hope someone has some ideas. I have a Remington 700P in 308. It was shooting Backhills match into .25 to .3 inch groups. It shot hunting ammo into 2 to 2.25 inches. The right locking lug was only contacting 10 percent, and the left not at all. Evidently the higher velocity was torking the bolt and destroying accuracy. I sent it to the gunsmith and it came back shooting everything about 2.5 inches. Until, after 20 to 25 rounds it shoots sub .2 inch groups. After it cools it again shoots over 2 inches and after 20 rounds again sub .2 inch. What the heck is going on?