Lyman made (makes?) their 311410 mould specifically for the M1 carbine. Got loading data with a note on what cycles the carbine in their "Cast Bullet Handbook".
Mind you, I ain't claiming that it is a good idea to use cast in ALL gas operated rifles. I'd take a good look to see how difficult it would be to clean when needed and for any really tight tolerances in the gas system first. I can tell you from experience that the M1 Carbine and the SKS are cast bullet friendly and the Hakim does fine with heavy hard bullets.
There are a lot of myths floating around the shooting world.
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