Originally posted by 5_Golden_Rings:
I'll bet you had a fun job. I'm assuming you also had to take into account the curvature of the earth?
no no no
Nothing like that....
I use to shoot competition 45 acp
The whole key to it was to make as much air pressure in the cartage as possible to get the bullet out with as little recoil as possible. I wanted compressed air more than I wanted a gun powder charge to fire the bullet down range. The farther I had to shoot, the more holdover I needed since it was not a normal round. I had to lighten the springs the whole nine yards to make it viable.
The velocity vs arc was key part of that since I was shooting VERY slow .45acp compared to off the shelf stuff.
In fact....just a bit of trivia....when you see those comp guys go out and look to have super human accuracy....you know.... like 7 shots in a single hole or hit bullseye on every single target...... what happened and what appeared to happen...might be two different things. They are not shooting off the shelf ammo, we all make our own ammo much weaker than what you buy off the shelf. Normally we want a mix of fast burn and slow burn powder to have all the power burn before the bullet exits the barrel. Basically as slow and small as we can make the recoil. .45 can vary a ton, but most rounds are between 800-1000 fps, I was shooting in the 600fps and some are in the 500s. In fact if I was to take an off the shelf round and fire it from my comp gun...the thing would likely break, I know the recoil spring would snap.
My .308 was actually opposite, to stretch it out I needed reliable fps past 600-700 yards.
