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- Jan 9, 2020
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Thanks to both @Dave Marshall and @northny for your answers. I thought it a bit odd that horizontal adjustment was dead on both vertical was off by 5%.
"They" say (they being the conventional wisdom of those who have been there) that you should tweak your velocity to match your DOPE out to 400 or so, and then tweak your BC for ranges beyond.
I've got a Sig Kilo 2400ABS and it offers the feature of truing drop (they call it calibrating) to match DOPE. I don't know whether that will tweak the velocity or BC or both as I haven't even been in that menu. I pulled the bullet profile from the AB Library which will pull AB's Doppler calculated BC and not just the published BC. I could instead manually enter the profile which will then allow me to adjust BC.
BTW I'm running a .338 Lapua Magnum and according to ballistic tables it shouldn't go subsonic until almost a mile. The day before I picked up the 2400ABS, I downloaded the app and entered my profile. The distributor I bought from has a private range with steel out to 1,680 yards. I synched the profile and made a first round hit at 906.
After that I pretty much just scared his plates.
Most apps have a feature that will true the velocity, which to me is the best way to do it. To tweak the values manually is tedious and too easy to screw up.
The Sig Kilo 2400 has the ability to use those custom Applied Ballistics curves. Those are right on the money, but they cost quite a bit for access to the software and data. It’s what I use, but it’s not necessary.