I don't understand this obsession with wanting to shoot heavy loads thru a light gun. A 6# twenty will knock your socks off when used with 1 oz. loads, and the rule applies to 12 bores under 7# as well. I have a Sarasqueta 20 bore that nearly tips the scales at 7#, and it is okay with 1 oz. loads. Do I use them? Hell no! A 20 is at its sweet point with 7/8 oz. field loads. And if you can't kill 'em with that, move on to a 16 with 1 oz. Enough of this light gun nonsense already. Chopper