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I looked on a JSB factory chart from a couple of years ago and it gave the Exact 35 cal as 0.045 but no Hades at that time. The Hades will likely be worse.

For comparison, the King Heavy had a 0.062 and the King Heavy Mk2 had an 0.054. They were the highest on the chart...

Your results may be different, as the bc depends on the barrel, obturation, temp, air density, and wind direction for an actual, relatively accurate, number...

Bob