Originally Posted by
Muley Hunter
As a rule conicals don't do well in deep rifling made for a PRB.
A PRB can work in shallow rifling if it's not pushed too fast.
So, from my testing it does matter somewhat.
Pete,
I think the spin is what's hurting roundballs out of quicker-twist rifles, Take your PRB out of a 1-60 at 1800 FPS. Now, if you want to shoot this out of your 1-48 twist rifle, you need to reduce the velocity to about 1440, to get the same RPM. Makes for an economical load, too, as it only takes half the powder. Probably only gives you half the energy, though.
OldBob