RE: 4 vs 5 shot size
 

I switched to a 20 inch from a 26 inch. After playing with choke/loads I got better patterns than I ever did with my 26 inch. If you like a short compact barrel for going thru the thick stuff like me don't let pattern worry stop you. You can get deadly killing patterns out to 40 yds in a short barrel. Again, just have to find the right combo for your gun.

By the way $30USD is overpriced for those shells. I get them here for $24 Cdn. Covert that and you should be somehwere around $20 a box.

RE: 4 vs 5 shot size
 

#5's work great for me but let your gun tell you what it wants.