I have a S&W Governor
It goes 16+ inches in ballistic gelatin with Federal Handgun Buckshot
Goes 11.5 inches in denim test so 1/2 inch short there
It is very similar to the ballistics of the .36 six-guns used by Wild Bill et al except that it is four times what they used to great effect. I am certain that it will easily kill a goblin
I use #7 shot on snakes and they dead. No debate.
I have never shot .45 Colt or .45 ACP but clearly that would work.
So considering the ammunition versitility, it is a great gun to have around.
I have shot around 100 rattlesnakes around my home, so I know that the CCI shot shells work real good in various calibers. So, no you do not need a Judge, I would spend a little more for the Govenor, but as an all around survival gun, it will do the job with multiple calibers and that versatility is fantastic.
https://m.youtube.com/watch?v=jrUKu3TBHnU&feature=youtu.be
Video showing 16 inch penetration in bare gel