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Old April 23, 2010, 10:58 PM   #1
M14MSgt
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Triple 7

I have a Pietta 1851 Navy in .44 cal. I have been using Pyrodex and recently bought a jar of Hodgdon's Triple 7. How much should I use in grains? I was using about 22-25 grains of Pyrodex.
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Old April 24, 2010, 04:33 AM   #2
Hawg
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18-20
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Old April 24, 2010, 02:36 PM   #3
arcticap
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See post #2 about how to calculate the equivalent amount of 777:

http://thefiringline.com/forums/show...&highlight=777

Quote:
If the max. load for a brass frame were considered to be 25 grains to avoid causing the brass frame to stretch, then 15% would equal 21.25 grains of 777 by volume.

The equivalent load for 20 grains of BP would be 17 grains of 777 by volume.
The equivalent load for 22 grains of BP would be 18.7 grains of 777 by volume.
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Old April 24, 2010, 03:03 PM   #4
zippy13
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Duhhh…

Someone wasn't thinking this out. Instead of multiplying by 0.15 and then subtracting that from the original number, it's simpler to just multiply the first number by 0.85!

X - (0.15X) = 0.85X
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Old April 25, 2010, 08:10 AM   #5
madcratebuilder
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In a brass frame 51 Navy a 18gr load of T7 would be about as much as I would consider. Depends on how long you want it to last.
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Old April 26, 2010, 02:16 PM   #6
arcticap
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Quote:
Duhhh…

Someone wasn't thinking this out. Instead of multiplying by 0.15 and then subtracting that from the original number, it's simpler to just multiply the first number by 0.85!

X - (0.15X) = 0.85X
That's true if you have a calculator or a piece of paper to multiply .85 X 25 grains with.
But to quickly multiply in one's head using easy binary calculations, first multiply it by 10% + 1/2 of that and you have the 15% to subtract from say 30 grains of BP. 10%(30) + .5(30) = 4.5 subtracted from 30 = 25.5 grains of 777.

Now just try to multiply .85 X 30 in your head.
If you can do it with any number then you're really able to use your head!

Last edited by arcticap; April 28, 2010 at 10:42 PM.
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Old April 27, 2010, 01:04 AM   #7
andrewstorm
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MATH CLASS ?

dONT U THINK A 30 GRAIN PELLET OF PYRODEX P WOULD BE A SAFE LOAD IN THIS REVOLVER,THE CANNISTER SAYS FOR CAP N BALL REPLICAS
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Old April 27, 2010, 05:29 AM   #8
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Quote:
dONT U THINK A 30 GRAIN PELLET OF PYRODEX P WOULD BE A SAFE LOAD IN THIS REVOLVER,THE CANNISTER SAYS FOR CAP N BALL REPLICAS
Not for a brass frame.
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Old April 28, 2010, 08:14 PM   #9
M14MSgt
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My Pietta is steel framed.
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Old April 28, 2010, 08:38 PM   #10
Hawg
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Quote:
My Pietta is steel framed.
Just sayin.
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