Bc hades .25

[Rathunter1964]

Hello can anyone tell what the real BC is for .25 hades pellets? Because if you searche in the ballistic elements app in the list the gave 0.036. Otherweise the hardairmagazine give 0.026 BC. What should be the right one?https://hardairmagazine.com/reviews/jsb-hades-26-54-grain-25-caliber-pellet-test-review/

 

[Florida_Man]

And the manufacturer lists it as .035.
Hopefully someone has tested it themselves. If I have time I will mount a scope on my 25 cal and run it. It’s been too long since I shot it anyways.

 

[Rathunter1964]

And the manufacturer lists it as .035.
Hopefully someone has tested it themselves. If I have time I will mount a scope on my 25 cal and run it. It’s been too long since I shot it anyways.

Thats what i hope to that some one did testing with the new fx ballistic calcualor

 

[Florida_Man]

Thats what i hope to that some one did testing with the new fx ballistic calcualor

I’ll go through my documents folder with my morning coffee. . I do remember now running several 25 cal with my labradar.

 

[Florida_Man]

Ballistic Coefficient = 0.033134

 

[JungleShooter]

Here is what I have collected online:

0.026: By HardAir Magazine (at MV = 913fps)

0.031: By Bob Sterne, a reliable tester and writer (at MV = 1364fps—786fps)¹

Important: Both testers entered the atmospheric conditions into their BC calculator, and used the GA drag model.


I still need to do my own testing.

Matthias


Source:
¹ https://www.gatewaytoairguns.org/GTA/index.php?topic=208773.0

 

[JungleShooter]

Ballistic Coefficient = 0.033134

View attachment 461243

Chris,

thank you for sharing your data!

Assuming typical Florida atmospheric conditions, the GPC ballistic calculator spits out the following BCs for the velocities in the table:

1: 0.0246
2: 0.0266
3: 0.0329
4: 0.0317
5: 0.0289
6: 0.0244
7: 0.0342
8: 0.0306


Something seems off with these BC values.... :
The variation between 0.024 and 0.034 is just very very large (42%).

And the BCs are spread out fairly even, as in "all over the place" — no concentration around a certain value....:
24.25.27.29.31.32.33.34


Not trying to criticize you and your shooting — just trying to make sense of the data. It wouldn't be the first time when the Labradar went off its rocker — or when wind messed up the data....

Cheers,

Matthias

 

[Florida_Man]

Chris,

thank you for sharing your data!

Assuming typical Florida atmospheric conditions, the GPC ballistic calculator spits out the following BCs for the velocities in the table:

1: 0.0246
2: 0.0266
3: 0.0329
4: 0.0317
5: 0.0289
6: 0.0244
7: 0.0342
8: 0.0306


Something seems off with these BC values.... :
The variation between 0.024 and 0.034 is just very very large (42%).

And the BCs are spread out fairly even, as in "all over the place" — no concentration around a certain value....:
24.25.27.29.31.32.33.34


Not trying to criticize you and your shooting — just trying to make sense of the data. It wouldn't be the first time when the Labradar went off its rocker — or when wind messed up the data....

Cheers,

Matthias

Thanks for all the work.
80 degrees
10mph from the east, so I was shooting into it. But my yard is fairly well protected
64% humidity
Pressure 30.13in (i'm about 30' above sea level)

 

[JungleShooter]

Thanks for filling in the blanks for me.

With the exact atmospheric conditions now there isn't a whole of change | it adds 0.0003. E.g:
BC of 0.0246 I posted is actually 0.0249.

Matthias

 

[Vetmx]

I have been using .026

 

[Rathunter1964]

I have been using .026

Thanks, i also gone use the 0.026.in my Hikmicro panther 2.0 PQ50 scope

 

[Ballisticboy]

0.031: By Bob Sterne, a reliable tester and writer (at MV = 1364fps—786fps)¹



Matthias


Source:
¹ https://www.gatewaytoairguns.org/GTA/index.php?topic=208773.0

Was MV really 1364 ft/sec? That is an awfully high MV for that type of pellet. It could also explain the higher BC value as the GA drag law is too high a drag at those velocities, which would give artificially high BC values.

 

[JungleShooter]

Was MV really 1364 ft/sec? That is an awfully high MV for that type of pellet. It could also explain the higher BC value as the GA drag law is too high a drag at those velocities, which would give artificially high BC values.

Yes, Miles, I was surprised myself (cf. the link to GTA).

However, high velocity BC values¹ are exactly what hunters need who want to take advantage of expanding hollow points that require a high impact velocity in order for them to expand.
The BC (likely several velocity-dependent BCs as GA is not a good fit) would then help to calculate the effective range of an HP (effective = at which expansion can still be expected).


And that is where I'd like to contribute data — whenever our local airgun range finally opens and I can start firing away in peace (as my cow corral gun range closed down)!

Matthias


¹ Not necessarily in the 1300's — but around 1000fps would already be very helpful.