Ok so a friend just shot a .410x73magnum through a .410 shotgun, i wasent around to wotness it but he tells me it was innacurate and left unburnt powder through the inside of the barrel. What info can u give on this caliber? Its not the same as a .410 is it? Hoe dangerous was this? Shot through a single shot break action rifled barrel .410. Agaib info on the caliber would be nice.