FX Hybrid Slugs .30 BC

[Seeker]

Cheers,

I can confirm that BC of them is pretty low - G1 0.07. It is aligned with what is printed on the sleeve.

Why do you think they have such a low BC?

 

[RobR]

If I recall correctly I was getting .12 , they’ve been working well for me. I do remember there being a correction on the Talon Tunes website and the number he gave is what I entered in my ATN products and was on target.

 

[Seeker]

I measured the speed at 50m and it was 242m/s when muzzle velocity was 270m/s.

 

[Dubs71]

The .07 is a misprint on the sleeve. It is .102 according to FX.

 

[Seeker]

@FX-USA, could you clarify?

 

[N2 Shooter]

Pyramyd Air has the updated BC on their website. It is very close to what NSA has for the 47.2gr slugs, so I'm pretty certain this is correct. Or we can do it the old fashion way and do muzzle velocity and 50 yards at a chrono and calculate it. Unfortunately I can't do that because I only have the FX Radar Chrono.

 

[SocalTrail]

I just got done doing some testing on those using a Labradar Chronograph and confirmed drops out to 200 yards and landed on a .092 BC with a muzzle velocity of 960. The claimed .101 or whatever was a bit generous, but very close. 

 

[Seeker]

@SocalTrail, would you be so kind and check their BC at 880 FPS?

 

[SocalTrail]

Let me see what I can do with the power wheel in getting the velocity down to that and I’d be happy to. The labradar makes testing BC pretty painless since you can collect velocity data points from 5 different yardages out to 100. After that I confirm with the actual drop. 

 

[Seeker]

Right. @SocalTrail, please let me know if you managed to obtain that BC around 880FPS.

 

[Seeker]

I've just redone my testing and the BC of 0.07 G1 is pretty much spot on when v0 is 880-900FPS. I don't think there is a printing mistake on the sleeves.

 

[Seeker]

Lastly, it is not possible for the hybrid slugs to achieve the same BC as the full blown slugs with the same shape (~ 0.1+ G1 BC in .30 cal). Hybrids have lower section density which inherently reduces BC.

I still claim that 0.07 G1 BC printed on the sleeves was not a mistake.

 

[GA_LeadHead]

I ran them on my labradar shooting from my Impact M3 600mm. My range was limited to 70 yards.

Avg muzzle velocity was 939 and at 70 yards the average was 826. Which gives me a bc of .08

Ballistic Coefficient (Velocity) Input DataNear Velocity:939.0 ft/s. Far Velocity:826.0 ft/s. Chronograph Separation:70.00 yd. Drag Function:G1. Temperature:68.0 °F. Pressure:29.33 in Hg. Humidity:48.0 %. Altitude:0.0 ft. Std. Atmosphere at Altitude:NoPressure is Corrected:Yes. Output DataAtmospheric Density:0.07337 lb/ft³. Speed of Sound:1126.1 ft/s

Ballistic Coefficient:0.080 Time of Flight:0.239101 s

 

[Seeker]

Right. That sounds true. If you push them faster then you can have a slightly higher BC like 0.08 but 0.1 seems to be a fairy tale.