We've published a special chart with .308 and M118LR information for 45 degree up/down compensation and compared it to MOAs and 1/4 MOA clicks so you can see how to apply this data to a BDC, target knobs, or an elevation ring.
Now we're getting ready to start cooking so pay close attention. Our first leap in logic: set in your brain that 45 degrees is the only data you truly must learn. Forget about the long lists in 5-dcgree increments, etc. Just learn 45 degrees and apply this compensation full-value on a slope of 45 degrees. Use half this compensation value when the target's at 30 degrees.
First, let me prove how valid this is by referring you to the .300 Winchester Magnum up/down compensation box. The .300 WinMag at 600 yards at 45 degrees requires 29.7 inches compensation; half that for 30 degrees is 15.4 inches^ which is very close to the 13.6 inches actually required.
Some precision fanatics are cringing because this generalizes, but appreciate how much faster you can compute things in your head and engage—and remember Captain McBride's warnings about slow reactions yielding nothing. While, indeed, this technique ignores 60-degree shooting, it's very, very close for 30 and 45
degrees, and seldom would even mountain and urban shots ever exceed 45 degrees.
That seemed fairly simple, but I've actually saved the easiest way for last—and it's so quick to both compute and apply that I'm calling it the quick fix.
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