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What should my bolt gap be on a brand new rifle? And should it change much after break in or a few hundred rounds? And when should I consider adjustment (rollers)?
 

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Somewhere around here there is a sticky on the topic of the correct bolt gap. You might consider running a search to see can you find it.

To answer your second question, you would install oversized rollers when the gap is too small to stay in spec.
 
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