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Author Topic: 577/450 and 45/70  (Read 1485 times)

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Offline 7 MM

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577/450 and 45/70
« on: July 21, 2009, 02:11:40 PM »
I think this is the place to ask this!
I do not have a cartridges of the world and no bookstore near me has one.
I am interested in the pressure differences (less , more) between the 577/450 martini Henry aand the 45/70.
Does anyone have any info on the differences?
using only black powder of course!

7 MM
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Offline patw

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Re: 577/450 and 45/70
« Reply #1 on: October 11, 2009, 04:29:36 AM »
The original 577-450 military load used a 480 grain bullet, 85 grains of black powder, and the 45-70 of course was loaded with 70 grains of BP.  I do not have any idea of pressures with either load.  Cartridges of the world lists that the old black powder 45-70 rifles will not handle more than 25000 psi, but there is no mention of pressures for the 577-450.

You may find interesting this article about a test done over one hundred years ago comparing the two calibers at long range: .45-70 at Two Miles: The Sandy Hook Tests of 1879.
http://home.earthlink.net/~sharpsshtr/CritterPhotos/SandyHook/SandyHook.html
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