M1 Carbine gas piston

[jimb16]

The cast bullets that I've shot are straight clip on wheel weights. I cast the Lyman 130 gr plain base, 120 gr Lee RN with a gas check and the 115 gr Lee with a gas check. As far as the burrs go, please remember that drilling a hole at 90 degrees is a lot less likely to leave a burr than drilling at an angle. The gas port is drilled at an angle. Even so, it is the exception, not the rule when it comes to leaving a burr (maybe 1 out of 50). BTW Painter, pure soft lead melts at a higher temp than alloys. So alloys would be more likely to melt at shooting temps than pure lead! You would think that harder bullets would melt at a higher temp, but they don't!