To cut them in half evenly I'd use a table saw if I had access to one. I'd build a jig by taking two boards a little longer than the barrel. Attach spacer blocks at the ends so that the barrel would set just a speck off the table, then fasten the whole thing to the table saw. Put a barrel in this cradle. You and a friend should be able to slowly turn the drum and cut it in half evenly.
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