Thread: Question

If you had a 6mm and .30cal and both bullets went the same speed will they both fall at the same point?

Almost definitely not unless they had exactly the same bc

And weight, more mass means more momentum and better retained velocity for the same BC.

That's what I was thinking but I couldn't think of a easy way to ask Google so you lot had to do.

JBM Toby

However Toby, in a vacuum they would theoretically. Its pushing through the air that makes the difference

You wouldn't be able to shoot in space because there is no oxygen?

Originally Posted by Spudattack

And weight, more mass means more momentum and better retained velocity for the same BC.

Same velocity but more energy for the heavier projectile right?

How does a compressed load fire then Toby?
Google explosives and how they work(I dont want a visit from the feds) Im pretty sure most explosives generate there own oxygen but have been wrong before.

Originally Posted by Wildman

Same velocity but more energy for the heavier projectile right?

yes

Originally Posted by Spudattack

And weight, more mass means more momentum and better retained velocity for the same BC.

Nope. BC takes into account weight.





(M is Mass)

Originally Posted by Toby

You wouldn't be able to shoot in space because there is no oxygen?

How do you think they move the ISS and satellites about in space. They use liquid oxygen but there is a bit of air (O2) in a cartridge so I'll bet it will still maintain velocity.

The Straight Dope: Would a gun work in space?

I'll take your word for it VC

The bullet would never land anyway as there is no gravity in space so the whole thing would not work!
Pretty sure nitro powders make their own oxygen but I could be wrong.
Why would you need to shoot in space Toby?

yep pretty sure weight doesnt have anything to do with bullet drop, just bc. Chuck it in on you ballistics callculator, e.g a 200grain bullet with bc of .5 going 3000fps will have the same drop as a 100grain bullet with bc of .5 going 3000fps