external ballistics, you would be correct. muzzle velocity?, i don't think so.
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murf
What was the original velocity of 45 ACP hardball?
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?
murf
Jim Watson
Member
Considering that the LeBoulenge and early counter chronographs needed wide screen spacing for reasonable accuracy, there might be some effect of ambient conditions. The "disjunctor" (stop screen) was at 100 or 150 feet. The start screen at 3 feet. Velocities were stated for the midpoint, 53 or 78 feet. Muzzle velocities were back calculated.
these guys were some pretty smart cookies and would have included elevation and humidity correction data if it was significant. the velocity variances were usually covered by a "+/- 25 fps" caveat.
must have not been very important.
murf
must have not been very important.
murf
lysanderxiii
Member
An early chronograph that measures velocity directly was built in 1804 by Grobert, a French colonel. This used a rapidly rotating axle with two disks mounted on it about 13 feet apart. The bullet was fired parallel to the axle, and the angular displacement of the holes in the two disks, together with the rotational speed of the axle, yielded the bullet velocity. By 1905, accurately controlling RPM at a known speed was well developed.
Old Dog
Member
Seems to me a lot of respondents in this thread really indulged in some over-thinking when it came to answering the OP's question.
In boot camp the Gunny told me the muzzle velocity of the 1911-A loaded with 230 grain hardball was 800 - 850 fps. Good enough for me, I don't need to chrono it ...
In boot camp the Gunny told me the muzzle velocity of the 1911-A loaded with 230 grain hardball was 800 - 850 fps. Good enough for me, I don't need to chrono it ...
RecoilRob
Member
This video shows an original box of 45's from WW1...and says 800 +/- 25fps. That's pretty early in the 1911 adoption so it would kind of be the 'original' loading...wouldn't it?
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