I use a belt slide, located in the front (where my blue jean's button is). When you eject the spent round your hand is already headed in that direction (more are less). You just grab a live round while you're down there. I wear the belt slide on a belt by itself or with my pistol holster and/or knife and wear it on top of my top layer while hunting. I usually put the belt on and then spin it around where the buckle is toward the back and the belt slide is in the front. I think my slide will hold about 10 rounds but I usually just put 5 or 6 in the middle loops. If I put 10 in, the ones on the ends tend to get knocked out and lost over time.
I bought my first deer rifle (NO 1 AB 30-06) when I was 15 years old. The belt slide is all I've ever used with it.