6pt,
The 10ga FB HB slugs is about 0.775" diameter with WW alloy. The weight is almost the same as the 12ga slug.
I found a local source of 97/3 pb/SN alloy. I plan to pick it up next week.
I agree my 60g ffg start load is a bit weak. Once I have a warm sunny day and a can of soft slugs I will slowly work up a load. The barrels are stamped 1 1/4 oz shot at 89 grains black powder. This load data appears lifted directly from the goex website or maybe goex borrowed it from pedersoli?
BB