GURPS ULTRATECH ballistics?

hal · 04-01-2017, 07:32 PM

Assuming a 7.5mm caseless round, that weighs 110 grains, its velocity must be 1470 feet per second in order to inflict 2d6+2 damage.

GURPS has the ammunition weighing roughly .006 lbs per shot. This measures approximately 2.72 grams

Hmmm. That stinks!

.06 lbs per round would be 27.2 grams - subtracting 7.13 grams for the bullet, the propellent would weigh 27-7 or 20 grams.

Does 20 grams to produce 750 Joules of energy sound realistic?

That works out to 37 joules per gram? Hmm.

Just had a 'how much do you love your wife and daughter moment asking for ice cream. Time for me to bail out until later...

One thing for sure is...

2.72 grams for a 7.5mm round seems AWFULLY low. :(

04-01-2017, 07:32 PM	#9
hal Join Date: Aug 2004 Location: Buffalo, New York	Re: GURPS ULTRATECH ballistics? Assuming a 7.5mm caseless round, that weighs 110 grains, its velocity must be 1470 feet per second in order to inflict 2d6+2 damage. GURPS has the ammunition weighing roughly .006 lbs per shot. This measures approximately 2.72 grams Hmmm. That stinks! .06 lbs per round would be 27.2 grams - subtracting 7.13 grams for the bullet, the propellent would weigh 27-7 or 20 grams. Does 20 grams to produce 750 Joules of energy sound realistic? That works out to 37 joules per gram? Hmm. Just had a 'how much do you love your wife and daughter moment asking for ice cream. Time for me to bail out until later... One thing for sure is... 2.72 grams for a 7.5mm round seems AWFULLY low. :(