150/200 20mm rounds 109

[Klauss]

after 150 shots being fired, 150 shells remain in the 109, if 200 rounds are being fired, 200 shells remain in the 109, that's 50 extra. 50 extra  empty shells, i see no modification in the weight of the 109.

[moot]

The 151/20 round is ~190 grams, the projectile itself is ~100 grams. 50 spent casings (if I understand you right) is about 10lbs.  That's if the casings still had the charge in them, which they don't, so let's say roughly 1/2 the weight for argument's sake.  That'd be a difference of 5 lbs of empty casings between a 150-round 109 and a 200-round one.

[VonMessa]

The 151/20 round is ~190 grams, the projectile itself is ~100 grams. 50 spent casings (if I understand you right) is about 10lbs.  That's if the casings still had the charge in them, which they don't, so let's say roughly 1/2 the weight for argument's sake.  That'd be a difference of 5 lbs of empty casings between a 150-round 109 and a 200-round one.

You forgot to include what effect that has on total speed (oh the utter shame)    

[moot]

I suspect it's not that big

[Klauss]

5lbs, where are they? , not to mention for the 30mm

[VonMessa]

No Brass, No Ammo Drill Sergeant!

(sorry, I had a flashback)

[moot]

5lbs, where are they? , not to mention for the 30mm

I don't know if it's just me, but I'm not even sure what you're saying.  What exactly's amiss here?