Have posted this at "AR" but can not get in now.

Looking for a questimate on "FPS" or maybe a quick load idea of middle of the ground type load

39 grains 5744xmp, 5 grains fluff over powder 550 grain gas cheched hard gast hammer head slug.

Also playing with the pyrodex pellets

2 50 grain and fluff to fill the space and a 535 Potstelie bullet