I wouldn't hunt with more than a 4 or 5 rounder for weight reasons, regardless.
I can totally agree with you on this one. Especially if you're doing a spot and stalk hunt, like hunting pigs in the summer time. A few extra rounds doesn't seem like it would make that much of a difference but after hiking for hours at time and carying round a rifle all day, it makes you wish you could lighten the load anyway you can.
I usually only load my magazines with five at a time anyway. When I thought I was limited to seven I just didn't want the game warden being able to shove more than that into one of my mags, just incase I was checked. Now that I know I don't have a magazine limit I can comfortably use only 5 rounds in my 10 round mags with out fear of doing something wrong.