45 ACP 7.5 Blackhawk Chrono FPS?

[trapperon]

Just out of curiosity--has anyone ever chronographed factory 230 grain hardball ammo out of a 7.5 inch Blackhawk Tube? Wondering the fps gain over a standard 5 inch 1911 with the same ammo.

I'm sure its not a huge difference, but just thought it would be nice to know if it was running over 900fps with the longer barrel.

Thanks

Ron

 

[tsubaki]

Man, that's gonna be a hard comparison with two different gun types and barrel lengths.
I did a test in my 1911 with 230gr FMJ's pushed with 10.0gr of Blue Dot.
The 5" barrel had velocities all over the place from 785 to 865fps.
When I swapped over to the 7" barrel the velocity was really stable around 980fps.
For the meanness of it I tested the XD Tactical too and it had a good stable average of 880fps.
Now, I also have a 16 1/2" carbine that ran a good average of 1063fps with the same load.
My conclusion is either the 5" barrel in the 1911 is shot out or it don't like the Blue Dot.

 

[WESHOOT2]

To determine velocity one must use the specific platform in question. Any other 'method' is called "guessing".

No exceptions.

 

[Jim Puke]

To determine velocity one must use the specific platform in question. Any other 'method' is called "guessing".

No exceptions.

The OP was asking about the variance in velocity between platforms...no change in method.

 

[trapperon]

Yes--in other words what I was asking is--has anyone had a 7.5 inch 45acp blackhawk and 5 inch 1911 together at the range and chronographed them both with the same factory 230 grain hardball ammo? just curious what the velocity difference was. I know the revolver loses a bit with the b/c gap, but should gain with the longer tube.

I will get around to doing this sooner or later, but thought perhaps someone had the answer already!

Ron

 

[WESHOOT2]

On the same day testing same-lot ammo in numerous 5" 1911s showed a velocity spread over 100fps between 'slowest' and 'fastest' guns; one must test or one guesses.

So to the OPs question, suppose one had a 'fast' 1911 and a 'slow' Blackhawk? Or reversed?

 

[Tommy F]

Good question, have tested several but not BH7.5