I have a question about sanding if anyone could help me out:

The Pit Bull instruction manual PDF on the website says not to sand beyond 220 grit, I have sanded to a very smooth 400 grit, it feels really nice but now im worried the stain won't take evenly.

Also there still seems to be some machine marks on the edge of the body, what's the best way I can get rid of these?

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Can anyone lend some advice?