I see a problem in determining if there is an exact grit number to Rough Buff.
I have just purchased a bottle and exactly like their High Gloss Polish, they have the same general instructions: your basic sanding before application of ROugh Buff will determine the length of the ball reaction.
Your basic Absolute Inferno has a 220 grit sanding and then RB is applied. Teh instructions specifically state that to get more length (and of course assuming less backend and hook), increase the sanded to grit to 320, 400 or 600 before applying RB.
Now, we know RB is not the same polish as High Gloss, but these instructions imply the same type or category or results.
This all makes me wonder what RB is and how it works as you apply it to the surface of the ball. I believe Brunswick because their High Gloss works precisely as described. The higher the preparatory grit, the greater the length, the less the overall hook and the less backend there will be.
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Bowling: Just like hand grenades and horse shoes, you only have to get close.
Life: Deal with what is.