45 ACP 7.5 Blackhawk Chrono FPS?

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trapperon

Blackhawk
Joined
Feb 7, 2006
Messages
787
Location
Grand Rapids, Michigan
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

Single-Sixer
Joined
Mar 3, 2013
Messages
413
Location
Savannah
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.
 

Jim Puke

Hunter
Joined
Jul 9, 2013
Messages
3,088
Location
South Georgia
WESHOOT2 said:
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

Blackhawk
Joined
Feb 7, 2006
Messages
787
Location
Grand Rapids, Michigan
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

Hunter
Joined
Mar 19, 2005
Messages
2,124
Location
Duxbury, Vermont, USA
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?
 
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