Black Powder Pressure Data in Wright's Book???

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25 April 2010, 20:25

Will

Black Powder Pressure Data in Wright's Book???

I have Wright's book somewhere, the 2nd Ed. I think, but it has been buried under too much junk as I can't find it at the moment.

If anyone is more organized then I and just happens to have their copy(ies) handy, did Wright ever measure pressures for the black powder loads?

Thanks.

-------------------------------
Will / Once you've been amongst them, there is no such thing as too much gun.
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25 April 2010, 23:28

peterdk

yes he did.

the 3'ed edition there are a some pressure tests of both NfB and Black powder loads.

What do you need, Will ?

best

peter

26 April 2010, 01:26

Will

If there is a comparison between the .450 NE and the .450 Nitro for Black, that would be of interest. Where my copy is I don't know.

According to Kynoch the .450 NE spits out a 500 gr. bullet at 2150 ft/s and 17 tonnes in a 28" barrel.

The .450 Nitro for Black is chucking a 350 gr. at the same velocity in the same 28" bsrrel but they don't say what the pressure might be.

If there is a 1 to 1 comparison for pressure difference that you could supply, that would be great.

26 April 2010, 02:52

JPK

Will,

Another source for black powder or nitro for black pressures would be Sherman Bell's articles in Double Gun Journal if Wright doesn't have what you're looking for. Bell did a lot of comparisons, iirc.

JPK

26 April 2010, 11:29

peterdk

will

350 soft point:

110 grains swiss 3fg: fed 215: 1680 fps: 9,0tpsi

140 grains swiss 1½fg: fed 215: 1725 fps: 9,0tpsi

Nitro for Black

70 grains Varget + cork wads: WLR: 1970 Fps: 9,2 Tpsi

52 grains IMR 4198 + dacron filler: RWS 6507: 1860 fps: 8,2 Tpsi

hope this helps.

best

peter

this data were from G. Wright's book: shooting the British double rifle, a must for every double rifle shooter

26 April 2010, 14:40

Will

Peter,

Excellent.

It shows, like everybody but I knew already, that indeed the mass of black powder has to be twice or more the weight of smokeless powder to get to the same place.

Thanks.

Bill