1 reload
For many years I had a leather belt slide for rifle ammo that held 12 rds and that is what I carried afoot. Loaded directly from it (4+1), so 7 rds as spares.
Lately I've come to be a fan of the butt cuff ammo carrier for rifles, and the elastic ones I buy seem to hold the odd number of nine, thus 5 spares. Much of my rifle hunting is sedentary now, on ROW's and green fields, and the fact the ammo is exposed does not trouble me. I like the convenience of being able to grab what ever rifle strikes my fancy an know ammo is on board and not have to search for ammo when time is short on a quick hunt, like after work.
For spring turkey, one may hoof it alot. Magnum shotgun ammo is heavy.
My vest has 8 elastic shell loops. Four of these hold extra strikers, calls, and a pen light. The other 4 hold extra shotgun ammo, the equivalent of one shotgun reload, for a total of 8 turkey loads (4 in the gun, 4 in the vest). I carry a trash round in a pocket, that I can slip in the mag and pump up, for shooting vermin