Not sure what you mean by marks on the brass. Yes it will leave chamber marks as any other type of rifle does. You can load a Bar 2 to any pressure level as a bolt. I feel that the BAR's are far superior in accuracy then any "Black Rifle". Down -side of Bar's are the "clank" when charging the chamber. Never try to charge the chamber by just pulling back on charging lever.. Always charge by bolt release disengage lever or their is a possibility of jam. Other draw back is heavy trigger pull not unless they fixed that on the BAR- 3's. Can shoot 1 MOA all day long. Being gas operated the BAR,s are at least 1/3 less recoil compared to bolt's. Great rifles.I just bought a 7mag in a BAR. I have never reloaded for an automatic, how do you guys check for pressure with the near max or max loads with autos?
does it still leave the marks on the brass as in bolt guns?
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