Pyrodex BP to 777 BP

B

BigV

New member
I am thinking of switching over from Pyrodex BP to 777 BP in my TC Omege.
According to the 777 load data :
Triple Seven is a high energy product designed to provide the muzzleloading hunter with higher velocities when used in the same VOLUME as blackpowder.
To duplicate a blackpowder load velocity using Triple Seven, you must decrease the powder charge by 15%.
Click to expand...

Since I don't weigh my powder charges, but instead use a volumetric powder measure, I should be OK using the same volume (130 grains) of 777 as I do Pyrodex.

I just want to make sure I am understanding this correctly.
Thanks,
 
If I'm doing the math right you should use 110.5 grains (by volume) of 777 to = 130 grains of Pyrodex. If you measure out the same amount you are increasing your load by 15%
 
I should be OK using the same volume (130 grains) of 777 as I do Pyrodex.
Click to expand...

Nope, reduce the volume by 15%. I use 100 grn of loose 777 and it gives me beautiful groups and good velocity.
 
The math is simple. 130 grains(volume) is the base load. 15% less is 110.5 grains.
Just a note: neither 777 (not 777BP) nor Pyrodex (Not ....y'know) is BP. Black powder is a mechanical mixture of Saltpeter, Charcoal, and sulfur. Neither of those two is.
Pete
 
Last edited:
If you currently shoot 100 grns. Pyrodex(by volume) meaning not measured by a powder measurer with a weight scale) , then you should reduce the 100grns. by 15% when shooting 777. Example: 100grns(Pyrodex) x .15 = 15, 100grns(Pyrodex) -15 = 85(777) Soooo, 100grns Pyrodex = 85grns 777. P.S. My powder measurer is calibrated in ten grn. increments so if I`m figuring for 120 grns.of Pyrodex that actually comes out to 120x .15 = 18, 120-18=102. When measuring round to 100grns. of 777.
 
In a "Real World" comparison - I found that 80gr of 777 2fg gave me the same point of impact as 95gr of Pyro RS and 90gr of 777 2fg worked the same as 115gr of Pyro RS when using 300gr and 350gr sabots.
In other words, at least in my rifle, it takes 15gr less of 777 2fg to equal an established load of RS.
 
You must log in or register to reply here.
Back
Top