Nope. Nevermind, not the game for you

. Nothing personal.
I found this in about 3 minutes on the web~
Caliber (Projectile weight (gr)) [Number of Rounds per 8.5 lbs]
9mm (124gr) [320]
.45 ACP (230gr) [180]
5.56x45mm (.223) (55gr) [320]
.30 Carbine (110gr) [300]
5.45x39* (Russian) (57gr) [355]
7.62x39 (Russian) (123gr) [210]
7.62x51(.308) (150gr) [160]
.30-06 (150gr) [144]
I might add something along these lines to the on-line appendix for reference. I have a bunch of MAG conversion work to do anyway

. But its definitely not what we viewed as core material (though I do wonder why this person picked 8.5 pounds as his increment... guess he got a lot of round numbers there).
We did include the weight of the weapons, in some detail, but ammo? I like the "stupid rule", and if I were to tell my players they need to count up all their ammo - by type - and figure out how much it weighs (assuming no unusual rounds have been requition and we are going to actually hand wave the weight of the magazines since magazine size/weight varies from weapon to weapon making any sort of standardized entry an appproximation),
I'd feel stupid because the next thing I'd be asking is "did everyone get their gadgets?"

In all honesty, Bond Movies and FPSs actually agree on this point - it is below the threshold of concern. Get back to the shooting

! Difference in playstyle to be sure.
Similarly, as a game designer, I have to keep an eye out for the pitfalls of flawless simulationism. Guns are deadly, and gunplay is a merciless endeavor in which luck has a painfully large contribution here in the real world. It's also short and final. With things like autofire, if you create a game option that is vastly superior to a normal attack and almost invariably fatal, you have to realize that not only will players gravitate to it, but NPCs should too - and by shear coincidence you are going to end up spending more time making characters than playing

. OTOH, movie physics tell us that namesless gunmen spraying lead never hit anything

! A state of affairs that might allow a PC to get to double digit levels eventually.
As to more rolling producing more errors, errors by themselves don't do anything when you are shooting - somebody has to spend an action die to apply the suck. We tried to provide the GC with a LOT more cool things to do with his action dice that go after you
every time you error, but if he does, tell him, from me, to knock it off

.
Moving on!