"progressive" powders and tight patterns

[OH Osthaus]

Originally Posted by John Dallas

Why does Nice Shot increase pressure so much? Is it denser than lead, so that it is heavier for a given volume?

i actually do not know- that is the figure that seems to be accepted

but the Nice shot site only says ""Nice Shot" has a slightly higher chamber pressure than an equal lead load."


i wonder if the figure came from here

http://randywakeman.com/Nice_Shot_Re..._Pressures.htm

"Nice Shot, at 14-16 Brinell, is no harder than 5% and 6% antimony lead, or the best “magnum” shot. Hodgdon Powder Company evaluated Nice Shot, and suggested that a comfortable area to load in would be subtracting 1500 PSI from their published lead data, although the average difference in pressure was less."

and

"High-antimony lead runs approx. 11.1 g/cc density. Nice Shot runs about 10.3 g/cc. While lead reloading data is by actual weight, proper shotshell assembly is by dimension. Using a lead charge bar for Nice Shot automatically reduces payload by about 7%, so no pressure issues are plausible. "