I absolutely agree with SL1. I shoot cast bullets exclusively in both my .45 Colt revolvers, and I have no problems whatsoever with my RCBS dies building up lube as described.
I think if it were me I'd quit using the Magtech bullets and go with something else. Lasercast is certainly one popular maker of cast bullets, but they're awfully hard for CAS style loads. I'd probably look to another brand that offers softer cast bullets.
Mike
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