I have a cz 527 varmint in a walnut stock it has always shot well but after fitting a zeiss scope I started to zero it but it would not zero properly the only way to get consistent poi was to do single shots and allow the barrel to cool fully between shots any more than a couple of shots and it started to shoot all over but once cooled down would return to zero.
I have just realised that with the moderator fitted and the front of the stock supported the barrel is touch the stock even though it's ment to be a free floating barrel. I am thinking that the stock has warped and needs the barrel channel sanding out to float it again.
Would the barrel touch cause the problem or is it likely to be something else causing the problem as the barrel gets warm. I know that the barrel getting warm affects accuracy but surly a heavy varmint barrel should take more than 2 shots to overheat even in the hot weather we are having at present.