I usually carry one round in each of my buttoned shirt pockets when using a bolt gun that holds 4 or so. I also carry extras in my pack because stuff happens.
I picked up a nice Browning parka a few years back that has ammo carriers sewn into two front pockets; one for shotshells and one for rifle ammo. you can flip them out so they hang outside the pocket if you think you're gonna have to make a "stand".
