BOLT ACTION = 2 x 25 rnd mags, 1 x 50 rnd mag (& sometimes a small speedloader if a long game)
ARP = 1 x 1,200 rnd drum mag
GBBR = 3 - 5 x 35 - 45 rnd low caps (& sometimes a small speedloader if a long game)
AR AEG = 3 - 6 x 120 rnd mid caps
PISTOL = 2 - 6 mags (depending on rif & other primary rifs + game length)
JUGGERNAUT (M249) = 1 x 3,000 rnd box mag (and a spare in the safezone)
SHOTGUN = 6 x 30 rnd shells & 2 x gas mags
REVOLVER = 25 x 1 rnd shells
I think that's about it. I don't often reload in a game as I like to just use what I have as efficiently as possible.