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Show me a 7.62 Russian casing that can seat a 240g round and feed in a semi auto and I’ll hit my balls with a hammer. The 300blk is such a short casing to be able to seat that huge projectile and only be the same OAL of the 223 cartridge. You 12 year olds really reveal yourselves around here. If the x39 could have done this the 300whisper wildcat would have never seen the light of day.
I have seen 217g x39 in a bolt gun, but it was limited to single shot because of the OAL.