i should explain where i am coming from.
Recently a 300 Wthy Mag was fired at a well known gas cylinder @ 25 -30m to see what the results were. The cylinder hardly moved in fact some onlookers said the shooter missed, a short walk proved other wise with a hole dead centre 3/4 up from the bottom through both sides. A 12bore with 1.5oz solid was produced and fired at the same range same cylinder. The results were the cylinder cartwheeled 6m the impact had started to tear the metal but entry did not occur. In summary the 300 had to much power and did little to the cylinder other than a perfect hole in and out. The 12 bore did not gain full entry but did move the cylinder 6m all the power staid with the cylinder. At that range i think i would get very friendly with the 12 bore it has to hurt more.
That new Woodleigh wadcutter is an old design using modern componets brillantly.