I was perusing CWC and looking at the Skelebots when the rail gun capacity caught my eye. The C-200 drum holds 2,000 rounds but weighs only 100 pounds. 100 pounds is pretty light for an unlimited endurance bot with a PS 30. So I started thinking about maybe the size of the drum was an issue. This silly thought lead me down the path of figuring out how large the ammo drum would be, and then that of other rail guns for comparison.
I'll skip all the math, but I used the density of Tungsten to figure out the size (volume) of each round, multiplied that by the payload, and then doubled it to account for the drum itself (feed mechanism, open space, etc). Here's the result:
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Weapon Payload Weight Drum Diameter Drum Length
C-40R 3000 190 lbs 8 inches 10.9 inches
(Samas)
C-200 2000 100 lbs 6 inches 10.2 inches
(Skelebot)
NG-202 6000 300 lbs 10 inches 11.1 inches
(Samson)
TX-50 2000 100 lbs 6 inches 10.2 inches
(Triax)
TX-250 3000 250 lbs 8 inches 14.3 inches
(Triax)
TX-500 1170 80 lbs 6 inches 8.2 inches
(Triax)
So the ammo drum for a Skelebot's C-200 would only be around 6 inches in diameter and 10.2 inches long. Plenty small enough to carry a spare drum. (Or even better, dual wield C-200s with two drums.) Most rail guns had similar results.