Typically anything between 36 and 220 depending on how rough of a surface you want. I prefer 120.Ok. What does 1 use ? I was told that 1 could use a 80-100grit sandpaper. By grainy u mean ??
Unless the track is rock hard or bites up (or syrup) I usually don't finish Burris any finer than 220g.The OP is on Burris.