Barrel Length Data?

[angryeyebrows]

Does anyone know of a chart that shows data (Velocity, Muzzle Energy etc.) for various AR barrel lengths, twists, ammo etc??

I'm looking for info on a 12.5" compared to say 10.5" or 16"

Any help appreciated.

Thanks

 

[USP]

have you looked at the ammo oracle?

 

[angryeyebrows]

Negative...I will google now!