Heathen wrote:assuming I can get some blue dot
Well, there's an assumption that I wouldn't go with.
Fast powders for pistol/shotgun use have been gone for months now, the fastest powder readily available right now is ADI AR2207 rifle powder.
Have a look on ADIs website for load tables to see if it meets your needs, it's significantly slower burning that Trailboss and much slower than Blue Dot but for rifle use there may well be a load recipe that you can use.
I've had great success with AR2207 in 357 Magnum loads with cast projectiles even though it's not officially approved and tested by ADI.
As the powder shortage goes on and peoples supplies dwindle there is going to be a lot more development and experimenting with different powders.