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Muzzle blast is nothing to really concerned about. Hodgdons has 40 gr as a minimum listed for a 55gr Nosler BT so the load you have is probably safe. The mark on the brass could be a scratch that occurs during ejection, or it could be something in the chamber causing it.
As far as pressure goes does the bolt have "sticky" bolt lift and is it hard to pull the fired case out? If not you're probably ok, take a loaded round and chamber it, then eject the loaded round. If the mark is there it's from ejecting or chambering and it's scratching on something, if it's only there after the case is fired its a chamber defect. Can you post a pic of the brass?
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