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 April 23, 2010, 10:58 PM #1 M14MSgt Senior Member   Join Date: August 11, 2007 Location: Lancaster CA Posts: 105 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.
 April 24, 2010, 04:33 AM #2 Hawg Senior Member   Join Date: September 8, 2007 Location: Mississippi Posts: 12,923 18-20
April 24, 2010, 02:36 PM   #3
arcticap
Senior Member

Join Date: March 15, 2005
Location: Central Connecticut
Posts: 2,973
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.

 April 24, 2010, 03:03 PM #4 zippy13 Senior Member   Join Date: August 23, 2008 Location: SoCal Posts: 6,440 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
 April 25, 2010, 08:10 AM #5 madcratebuilder Senior Member   Join Date: November 2, 2007 Location: Northern Orygun Posts: 4,919 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.
April 26, 2010, 02:16 PM   #6
arcticap
Senior Member

Join Date: March 15, 2005
Location: Central Connecticut
Posts: 2,973
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.

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.

 April 27, 2010, 01:04 AM #7 andrewstorm Junior member   Join Date: October 4, 2009 Posts: 198 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
April 27, 2010, 05:29 AM   #8
Hawg
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Join Date: September 8, 2007
Location: Mississippi
Posts: 12,923
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.

 April 28, 2010, 08:14 PM #9 M14MSgt Senior Member   Join Date: August 11, 2007 Location: Lancaster CA Posts: 105 My Pietta is steel framed.
April 28, 2010, 08:38 PM   #10
Hawg
Senior Member

Join Date: September 8, 2007
Location: Mississippi
Posts: 12,923
Quote:
 My Pietta is steel framed.
Just sayin.

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