Originally Posted by doublebull
I went shooting today to practice for my first 1000 yard shoot I shoot a 6.5 284 that i built its got a 28 inch barrel with the ratchet 4 riflings in it i shoot 140 gr berger and have a ballistics program on my i pod i shot at 220 yards without making adjustments it was 2.5 inches low then i shot it out at 420 yards and was 21 inches low then went to 600 and i had to dial up 9 moas i put that in my program and it said i had a bc of 1.75 i shoot 2970 fps just was wondering if someone had any ideas. im lost i was also shooting at 3270 feet elev. every thing matches for that bc
Your ballistic program should have a basic set of information to input, then it will give you a drop chart that should be relatively close to reality.
If you can provide some more details, I am glad to run the numbers in Exbal and post the drop chart that it produces. Here's what we have and need....
Bullet: 140grain Berger VLD (or is it the Long Range hollow-point boattail?)
BC: .612 for the VLD (the LRHPB is .618)
Muzzle Velocity: 2970
Site-in Temperature: ??
Scope Height (distance from center of bore to center of scope): ??
Site-in Distance: 100yards?