19”L X 7 1/2”W X 14”H
FWIW, it’s tougher to lay your hands on ammo cans. They are now considered traceable items and not freely procured anymore. Additionally, I saw somewhere, ..I believe some homeland security regs label ammo cans as being associated with items of interest for ‘terrorists’. Some perceive them as providing justification for arrest or at least a ticket and confiscation if observed during a traffic stop. Just be sure to relabel/repaint yours so it isn’t as quickly so identified by the illiterate legalist.
“20MM” is the form of answer I was looking for.
There’s a vendor at the local periodic gun show that sells virtually nothing but ammo cans, in all sizes.
There’s one coming up in mid-September.
Thanks for the info.