[TaroBear]

4+1 SIG 552 Lowcaps
12+1 shotgun shells
6 1911 .45 magazines
2+1 Beretta 92 Magazines
4+1 PPSh Drums

Not all at once, obviously. I'm considering ditching spare mags for a sidearm completely when I'm using the PPSh, since the drums are so damn bulky on the rig already. Sidearms are a must for the shotgun, though. I use my sidearm more than my long guns, so I usually carry more 1911 mags than anything else. I'm a big fan of using my pistol instead of reloading, so I don't often need to carry that much primary ammo.