is there a easier way to find it?
like if i chrony it and messure the angle and do something with those numbers..
Yes, you can talk to me. Although my range calculator isn't public release yet, it is mostly working, so I can give answers for things like this.
I've looked it over, and using a variant of the Gs drag model, my guess is that because of the poor drag characteristic of a golf ball, unless you induce backspin, even at 2400 fps, you're unlikely to fire said ball more than about 500 or 600 metres (depending on the angle).
Spheres aren't good supersonic projectiles, and they'll slow down from 2400 fps to below 1000 in the blink of an eye.
It'll do about 200 or 250 feet of flight in that time - a healthy distance, but if you consider that the extra 1400 fps contributes less than a 100 yards extra range, you'll recognise the diminishing returns involved.
The goal of a mile golf ball shot is an impossibility, because in order to fire a golf ball that far, the ball would have to be fired so fast the friction from drag would cause it to immolate.
With backspin, obviously you'll gain range, but it won't triple the distances to your desired mile-plus ranges.
I don't think you'll need to worry about methods of finding a golf ball that's flown a mile, because it's not going to go that far - sorry, but it's the truth.