Re: loading berger 130 vld in my 264wm
get a dry erase marker and color the bullet, then chamber it and watch for distinct circumferential dashed marks that would indicate touching the rifling. There will probably be a lengthwise line from extracting the cartridge, ignore that.
You will feel a camming action when closing the bolt on cartridge against the rifling.
or, get a hornady LnL gage and modified case.