10 gauge loading question

[J.B. Books]

I am all for experimenting within reason but there is no comparing Nice Shot to Bismuth and by substituting Nice Shot for Bismuth in a published Bismuth load means you have no idea what the pressure is. There is only one published load for Nice Shot in the Short Ten and it is a 1 3/8 ounce load. Nice Shot can be substituted for lead in any published load but you must add 1500 psi to that load when using Nice Shot. Bismuth being lighter requires a taller shot column than an equal weight of lead. That means more surface area against the bore and more pressure. I would not feel good substituting Nice Shot for Bismuth but I would be fine using it in a lead load with low pressures. From what I understand all things being equal a roll crimp reduces pressure 600-800 psi over a folded crimp all else being equal.