Had trouble finding 12 ga slugs last year around this time and after sighting in the shot gun, only had a handful left for hunting ( and unfortunately still have them).
I bought a lee 7/8oz slug mold and cast some 12ga slugs with what I had left in the pot. Using the Art Pencil test for hardness, it’s around 14 Bhn
The mold instructions say to use pure lead, but if you use hard lead, then multiply by .93 to calculate slug weight.
7/8 oz = .875 oz
.93 x 7/8oz if using Linotype = .8137 oz.
The slugs are weighing .8110-.8140oz
Question is, do I need to adjust the powder down for (lighter) hard lead slugs ?
Will be using BPI#078 wads and likely Winchester super X hulls. Not sure on what powder yet. Have a bit of Red Dot and 4 or 5 other choices so I’ll try a few.