This is a work in progress. The 44-77 Sharps is supposed to be .446"-.447" groove diameter. So far, we haven't found anyone that has ever seen one that small. .450"-.455" is more like it. The original was soft lead and a hollow base. .449" might not be large enough so slug your barrel.
We might have to come up with something different
44-77 Sharps 390 gr. .449"