Hi guys i was lookin to get a slug gun soon and i was wondering what you thought of the ultra slug with a thumbhole. the place where i'm lookin has 2 ones a 12 and ones a 20. what do you thinkn it better for longer ranges the 12 or the 20 and if i have winchester 3" 265gr. partition gold 20 gauge do you think it will knock deer down like a 12 would. Thanks