I have shot 115 gr hard cast bullets in my GI carbine without any serious leading problems. I did take my gas cylinder/piston apart( I do have the GI wrench) and cleaned the parts throughly. Also cleaned out the barrel bleed hole after each session. I must admit that these loads were just plinking loads, and loads I let the Jr CMP members use. My loads were worked up just to get 100% functioning with cast bullets.
I've got way over 5,000 cast loads thru my carbine and have yet to clean the gas syste. Have cleaned the barrel and action a number of times of course. So far have had no problems at all.
My load is 100 gr. Lee bullet 90301, my own lube, 12 gr. 4227, good plinking load and inch and a half/two inch accuracy at 50 yds, not bad with open sights.
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