Originally Posted by ClapperZapper
Something is amiss with that load.
Is that wad suitable for a Fiocchi hull?

I ask because I shoot many 1oz Clays powder loads, and never have un burnt powder.

Possibly, but I think it is more the roll crimp opening up before a star crimp would have and lowering the pressures. I had similar results when I started loading 2.5" 16 g with fiber wads which mostly went away when I went to a plastic wad

I have become addicted to English hammered shotguns to the detriment of my wallet.