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Interesting. Tight chamber maybe??
You could mic the rim thickness and check against your bolt face, depends where they're getting stuck...

That's a point.
You can also lighten the hammer spring in the trigger group (and polish the sliding surfaces while you're in there)

The firing pin rides "up and over" in a 10/22 bolt, and does need to be struck by the hammer spur. There should be no means of it slam-firing unless you have exceptionally tight headspace or an...

I believe the 10/22 bolts are case hardened. Which means a) you don't want to remove metal from a bearing surface and b) if you "chuck it in a mill" without consideration of that you're going to...