I typed in the google search engine "6.5grains = grams" or something like that and it spat out 0.42g.

1 gram = 15.432358353 grains
6.5 grains = 0.421192915 grams

http://www.unitconversion.org/

The grain science look inconsistent. I saw so many different values...

Just stick to the important measurements.... 1lb is 16oz....1oz is 28 grams.... XD

Okay, well if you have your muzzle completely horizontal, you're looking at 275FPS for a BB to go 150 ft if your muzzle is 58 inches off the ground.

For basic computations without getting into the complexities of Drag (unless you plan on borrowing the NRC windtunnel to get your drag coefficient), weight doesn't apply, as it's an "external force". Find any online ballistic calculator and put in 5g and compare that to the answer you get with 150g. Same results.

Basically, you're dealing with horizontal velocity, gravitation acceleration, distance and height.

I threw in Fox's BB Gun velocity into my calc and show a distance of 246.62 feet (that's for a horizontal shot with a 58" gun height).

For our purposes, BB weight is mainly going to affect stability and how it punches through foliage.. and how big of a noise it makes when it hits the wall of a CQB house :)

Here for some math:
http://www.grc.nasa.gov/WWW/K-12/air...ballflght.html

You know, I've actually thought about heading over there and setting up a little model of a spinning BB and getting some aerodynamic footage at various air speeds. Maybe someday. Lol

Lemme know when you do that I wanna ride my bike in the windtunnel for some tests :)

Lol, that'd be the 9m windtunnel (we actually have four or five windtunnels, two are at Uplands.) Ya actually, we used to do a lot of NASCAR testing at the 9m one.

http://img3.hostingpics.net/thumbs/m...4okexemple.jpg

Im work on that pass time maybe 6 mouth and is better im make..... On bed whit this ammunition im cover easy 200 ft at 400 fps whit really good precision....

But whit bb and tubular form i think is really better im suprise that do not exist in market.....

If you take tubular bb whit twisted barrel you make really different airsoft....
But airsoft club can accept this special bb ?

That looks like gum balls and drugs to me.

Uppers and downers, thats one crazy airsoft game!

For small scale tests, the mythbusters made an homemade windtunnel with a Fan and packs of Straw. Sadly I do not have any link.

The most aerodynamic shape is the teardrop. If you implement this is any way I want 15%.

does a lower drag coefficient mean more stability?
Does it??

Yes. There's a reason footballs are teardrop shaped.