Caliber size?

Like I'm serious; I need to know cuz my gun has to still fire 19 bullets a second, but fire reasonably sized rounds so it doesn't jam.
 
Well please ask I do need help; it's clip is reasonably small but not too small to the point of pistol uselessness; but its supposed to hold 60 rounds in one clip....
 
Ask him what he thinks a near-future SMG should hold caliber-wise;

Its supposed to fire 17-19 rounds per second

and it's supposed to hold about 50-60 rounds per clip.
 
Drats. Because a few SMGs I looked up had .200 cal bullets but they only fired about 15 rounds a second or less; so I'm wondering if mine should be less to avoid possible jamming
 
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