Hornet22savage said:
Now I know that somewhere on here this has been covered but I'll ask again. If I have a given load of Pyrodex RS that gives me say 1500 FPS velocity and wanted to switch to Triple 7 2F. How much do I cut my load by to get the same performance? I beleive it is 15% but I'm not sure. I know that you cut a load of Triple 7 3F by 15% to equal the performance of Triple 7 2F.
Here you go. . .
http://hodgdon.com/
Under the Item "Data", there is "Muzzleloading data"
Click on Muzzleloading data
That gives you the velocities of your powders vs the bullet/ball.
First thing they say, is that Pyrodex and triple 7 "Pellets" were developed to preform the same. One may be a little cleaner than the other, but they are built to have the same velocities, barrel pressure, and same volume measurements.
I would not worry that much about being exact on velocity. When you are traveling at 1500 FPS, +- 10 percent is hardly negligible on target impact. I can probably say +- 200 fps is hardly negligible in target impact for the first 150 yards. or so.
Without going through any Calculus or equations, I am guessing about 1" at most at 150 yards.
This is why I shoot Pyrodex vs triple 7. It is 10 dollars cheaper here, and the performance is the same. Pyro may be a little dirtier, but heck. . .I have to clean my gun anyhow. . .so why not enjoy the time cleaning it too.