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Ran across this today and thought I'd share.
This might also shed some light for some as to trajectory of heavy conicals.
In 1997, I had to prove to my local range BOD that my trajectory was safe for someone in the pits. JBM ballistics is all I had, I plotted out every 10yds from muzzle to 1000 of my BP load and compared a HP 30-06 on AutoCAD and determined the flowing graph. The photo shows the pits and the counterbalance target frame along with the seat and concrete wall & dirt hill behind the target puller. Trajectory is show at the lowest spot possible.
Back then, I don't recall that BC was a consideration in JBM, but I came up with right at 4 degree impact angle based off my drawing, 30-06 was 1.5 degrees.
Two impact lines approaching from 1000 yards; 530gr lead bullet with BP @ 1300 MV fps.; 30-06: 180gr @ 2700 MV fps. I don't recall the 30-06 MV at the target, but the 530gr BP load was around 800 fps. Remember, this was done nearly 20 years ago, based on this I was approved to hold matches.
This might also shed some light for some as to trajectory of heavy conicals.
In 1997, I had to prove to my local range BOD that my trajectory was safe for someone in the pits. JBM ballistics is all I had, I plotted out every 10yds from muzzle to 1000 of my BP load and compared a HP 30-06 on AutoCAD and determined the flowing graph. The photo shows the pits and the counterbalance target frame along with the seat and concrete wall & dirt hill behind the target puller. Trajectory is show at the lowest spot possible.
Back then, I don't recall that BC was a consideration in JBM, but I came up with right at 4 degree impact angle based off my drawing, 30-06 was 1.5 degrees.
Two impact lines approaching from 1000 yards; 530gr lead bullet with BP @ 1300 MV fps.; 30-06: 180gr @ 2700 MV fps. I don't recall the 30-06 MV at the target, but the 530gr BP load was around 800 fps. Remember, this was done nearly 20 years ago, based on this I was approved to hold matches.