In the name of loonyism I recently re-bedded my 243 and 270 MT's.
The 243 is still curing but I shot the 270 early Sunday morning before the breeze came up and it planted 5 shots into in nice round 1.5" group at 210 yards.
Bedded the tang, the lug and 1" forward. Re-read instructions on this thread and (carefully)dremeled out the bottom of the lug post-bedding.
I hadn't done that before and am pretty sure it was causing random flyers every 8-10 shots. Always blamed the wind or barrel heat but I think the lugs were bottoming out and the action was shifting a little in the stock.