Accurizing rifles???????????

[Blktail]

I have a Pre-64 Winchester Model 70 Featherlight in 30.06. I have just started reloading for the gun. I have found a lot of horizontal variation between loads and would like to glass bed the gun. Where can find directions and advice? Presently, the stock and barrel are tight right to the end of the stock.

As it stands now, only very light loads have tight groups. Hotter loads spread and shoot high and right.

Thanks in advance for your help.