Tuning Ballistic Coefficient Database for .30 and Larger Slugs?

Airgun Al

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Dec 6, 2023
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I have examined the very detailed "Ballistic Coefficient Database" at Hard Air Magazine.
A wonderful source of information!
However, only 3 entries exist, for .30 and larger projectiles....
This has me wondering....

1. Are there any other B.C. databases that exist, that include the larger/heavier airgun projectiles?

2. How much emphasis would you put into BC Coefficientcy, when choosing particular caliber and projectile, for long range accuracy?