Ed Harris's load of 13gr. of Red Dot should & does seem to work in all ctgs. for a low velocity of around 1,300fps, and with good accuracy. If you wanted to try a shotgun powder, perhaps this is a good choice.

Blue Dot has given pressure excursions in some small bore loads, ie: .223 and some .20 cals. Perhaps the larger bores will be more flexible with it?

The 'problem' seems to happen with the slow burning shotgun and pistol powders. They are just fine, everything's normal, then WHAMMY - everything isn't so fine. It doesn't happen to everyone, if that's a consolation.