Yes, it silly. Theres a few things that makes some guns more deadly than others
1) effective rate of fire, as measured on the order of maybe a minute. Here I include including all factors such as action, magazine capacity and reload mechanism
2) killing potential of a single bullet/projecticle
3) effective range
So a semi-auto handgun, is alot less deadly than a semi-auto rifle, because the effective range is alot less. On the other hand, I'd say its more deadly than a bolt-action rifle, because you can put out more rounds in a shorter period of time, despite the individual bullets being less deadly in most circumstances (except for maybe some edge cases like a .22 carbine vs a Desert Eagle)