In all the years I have hunted with a muzzleloader, I have never had to swab. Although I did once, even though I could have loaded another shot. Whether I was shooting Goex or Triple Seven powder. Seldom do I get more then two shots in a day. And since I clean my rifle at night, no matter what powder.. swabbing while hunting is a mute point with me.
Now you guys shooting extreme distances, I might see the need to swab, if you say...
missed 
or needed a follow up shot. Or just if you wanted to keep hunting..