Thank you Mike.

Simple as I should have guessed.

Does it make a difference where in the sanding regime the "whiskering" occurs? That is, 'sand at 220, whisker, resand at 220, rewhisker, etc.' or 'sand at 220, whisker, sand at 400, rewhisker, etc.'?

I've done a few stocks but never to this level of detail. The one in process is an experimental platform. Probably putting more effort into the stock than the rifle would ever be worth but it's good practice for something finer.