Ffg vs fffg

[Hiddeninsmoke]

So the faster twist I have the slower burn I need ,

It has more to do with the length of the barrel. A slow burning powder in a short barrel may result in some of the powder completing it's burn beyond the muzzle, a waste of powder and gases created. Likewise, a fast burning powder in a long barrel may accelerate the ball too quickly to gain a hold of the rifling, a waste of twist and accuracy. It is a matter of trial and error to find what is right for your gun.

 

[jimairwin]

I’m really looking for some science on how the powder sizes react. Would a faster burning fff push my round ball out of the short barrel too fast to allow the rifling to get the spin up to speed?

no way

 

[jimairwin]

i have ”quick” question . I have an Investarm 50 cal Hawken, carbine. A short barrel I bought from cables a long time ago. I’m having trouble with my groups. I’m shooting 70 gr of fffg pyrodex. cause that is what I can get locally. I’ve tried various patches and powder amounts with no improvement on my groups. If I can keep it on a paper plate at 50 yards I’m lucky. When I first got it I shot 75 gr of ffg elephant real black powder with acceptable results. My question is will the burn rates of ffg to fffg be different enough to cause t
my problem?
thanks!!

Your question is unanswerable quickle. Grains is a unit of mass/weight equivalent to the mean/average weight of a single grain (seed) of barley. If you're shooting 70 gns (weight) of P-dex, you're overloading by a lot. 70 gns setting on a BP measure gives a much lighter charge of P-dex, with approx the same energy as 70 gns of BP. Elephant is considerably weaker than other real black powders by about 10%.