I've been laying off the shotgun slug loads for a while now. No slugs. Yesterday was nice and cool, so I cast up 100.
I don't know if this has been tried before, but here I go. Yesterday, I was fitting and measuring the slugs and the WAA12 wads, which are one of the recommended in the load data. As you fellas know, the Lyman slug has two diameters. The front driving band, and the skirt. The front band is approximately .010 larger diameter than the skirt diameter. Thats why the WAA12 wad petals are thinner at the top than at the base. With the slug in the WAA12 wad, the diameters are .726 at the top, and .725 at the bottom skirt. I only tried one wad and slug combination. These diameters are "average".
A few years ago, I made a sizer die that was/is .672. Fast forward to now.
Now, in my quest for a better fit down the bore, (which I slugged at .729) I have the Helix Cushion Driver wads with the thicker petals, no taper. So, I sized the Lyman slug to .672 and dropped it into the HCD wad. The average diameters are .730 at the top, and .735 at the skirt. This should make for a lot better fit and seal down the bore. Looking forward to range session very soon. I'll let you know how they perform.
Regards