Paying respect to the previous thread on How to fit 1000 rounds of 7.62x39 in a .50 cal ammo can.
Here's how to fit 42 boxes of 30 5.45x39 in a 50 cal ammo can=1260 rounds
bottom row
[URL=[URL=http://s135.photobucket.com/user/mindcrimeopr8r/media/20161120_152906_zps8o6y6xos.jpg.html][/URL

middle row
[URL=[URL=http://s135.photobucket.com/user/mindcrimeopr8r/media/20161120_153448_zpstmvyccqr.jpg.html][/URL

top row
[URL=[URL=http://s135.photobucket.com/user/mindcrimeopr8r/media/20161120_153825_zpsa9ha5op9.jpg.html][/URL

Greatness.

I'm sensing a pattern here.

I prefer to have my ammo on stripper clips, and ready to load in the mag. instead of in boxes and then taking them out to load them in the magazine one at a time.

630 rounds 5.45  in a 30 cal can total 1260;
http://www.hunt101.com/data/500/medium/ammo10.JPG


500 rounds .308 in  50 cal can;
http://www.hunt101.com/data/500/500_rounds_308_on_stipper_clips.jpg


1,000 rounds 5.56 in 50 cal can;
http://www.hunt101.com/data/500/1_000_rounds_5_56_in_50_cal_can.JPG


1310 rounds 7.62x39 in S.A.W. can;
http://www.hunt101.com/data/500/1210_rounds_7_62_ammo_on_clips.jpg

you can fit 1350 rounds of loose 5.45 in a 50 cal can.