For the feeding issue try another magazine. That type problem more than likely is a magazine issue. Has this gun been re barreled? Can you identify the area of the chamber that is catching? Maybe all you need is to lightly polish the edge that is catching.
For your loads post some pictures of the primers. Depending on how your cases look you might need to check the head space checked. Hard to say without seeing your problem. Under speed and over pressure does not compute. Do you have a case gauge? I would be interested in how a fired case fits in a 308 case gauge.
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