B.C of Hades .25 .026 ?

The BC is a dynamic value. It will vary with velocities, A>B distances, twist rates, et al. 

Can you provide more insight and details into what you're trying to do and what you're having trouble with?

I am new to longer ( to me) distances and recently started playing around with my Impact .30. I input the data, my zero is at 30 and I put in 100 yards and it calculates 46 clicks and it was literally dead on the money.

I tried the same on my crown with the JSB Hades and 30 yards and 60 were really close, maybe a tad high and 100 was 10 clicks off, oddly enough it likes the exact same clicks as my Impact at 45-46.and very close to my JSB Exact kings. My JSB kings math is spot on as well,42 clicks for 100 at 920fps. Strelok shows 55 clicks for the Hades at 870 fps so I just don't know where the math is wrong. Possibly I just need to go back to 30 yards and make sure that is dead on and see if the rest fall in line but didn't want to keep chasing my tail if the BC is wrong. 

Strelok shows JSB Exact King Diabolo .038 and a normal King .036 but doesn't say anything about diabolo in the Hades. Probably just a description error but being so new I wasn't sure if this was the correct info.
 
Are your Impact and Crown barrels different in length?

Both 700's but I am not really trying to compare either as the impact is a .30. I just meant that the math works perfect for both guns with 2 different combos but the hades appear to not be following. it looks to be warm the next few days so I will take some more time to plot this out and possibly just raise the BC as mentioned if that's the easy solution.
 
The 0-30y BC may very well be 0.033 - 0.036, and a 0-100y BC of 0.026 seems possible to me for that projectile.

thanks for the info. I'll do some more testing tomorrow and try to make sense of it. It does appear it's maybe the opposite of that though. It shoots higher at far than the bc calculates so wouldn't that mean the other way?