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Old 09-27-2017, 07:28 PM   #62
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Join Date: Aug 2004
Location: Wellington, NZ
Default Re: GURPS ULTRATECH ballistics?

Originally Posted by mlangsdorf View Post
For rifle caliber bullets, 3G3 suggests roughly a 3:1:3 ratio of bullet mass to propellant mass to casing mass. A caseless round should weigh about 4/7ths an equivalent cased round - and when you consider that you're really evaluating TL6 cased rounds with moderate REF propellants versus TL8+ caseless rounds with higher REF propellants, you can get half the weight.
Except that caseless propellants need binders, stabilisers, and other additives that cased propellants do not. That's why the propellant weight of the 4.7mm caseless is so high relative to bullet weight.
Rupert Boleyn

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