Just a couple of points for comparing different calibres:
Unless you are going to use Maximum Point Blank Range, don't compair bullet drop. Use danger space instead:
Let's say the deer is at 400m and the vitals are 200mm across.
Set your zero distance to 400m and take note of what distance the bullet is 100mm above and below the target.
Subtract the Max distance from the Min, and that's your danger space.
The bigger the value the better.
Also keep the sectional density similar when comparing different calibres for a fair comparison.
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