when I was looking into humane dispatch, this was the main reason for the shotgun route, rather than FAC, seemed alot easier to get a SGC and purchase a single shot 410 hushpower for the job, my FAO was in agreement that it would do the job sufficiently,
having used it a number of times, with 2 1/2" subsonics it does the job perfectly,
also as it can be folded in half, its much more discreet when carried into a homeowners property (bagged) as for noise, it is hardly noticable, my last fox job, a lady was hanging washing two gardens away, she never bated an eyelid