OldCrow
No sir, I wasn't trying to be clever or cute. I believe you will find this post of Bob's over at AGG informative. It is dated but sometimes the old stuff ages well.. I guess I should add here that my perspective is often influenced by a comparison between the PB world and the AG world. Clearly the drift comparison between those two worlds is all about TOF. No hidden agenda. No animus.
https://airgunguild.com/index.php?topic=1172.msg12846#msg12846
Ahhhh, so you meant this? Where he says faster results in
more drift above a certain point...? Even though the pellet spends less time in the wind?
{As you extend the range, the optimum muzzle velocity increases.... as you want the pellet to spend as much time in "low drag" mode as possible.... However, at 200 yards with a pellet the optimum is still only about 950 fps (see the BC = 0.05 on the first chart).... It depends on the pellet, of course, but the
minimum drift at 100 yards would probably occur with a good pellet, like a JSB Exact, at around 900 fps.... One thing to remember is that the curve is pretty flat across the bottom, so going 50 fps higher than the absolute bottom won't change the drift much but will give you a flatter trajectory....
One thing that isn't taken into account in the GA drag model is that the drag increases faster than it predicts in the Transonic region (Mach 0.8-1.2).... Some measurements I have made indicate that at Mach 1 the GA model may underestimate the drag by 30-50%.... While this won't affect the middle of the curve, it will raise the right hand end.... ie
the drift at 1100 fps will be significantly more than the graph shows.... All the more reason not to push over 1000 fps with pellets.... Bob}
