7625 is a very good powder for low pressure 12ga loads. The vintage shotgunners love the stuff for that reason. There were published loads using it with chamber pressure reading (PSI) down in the mid 4K and 5K range to start.
Usable in 10ga for the same reason.
I had two 12# kegs of it,,the black steel drums. I went through one of them and still have the other unopened.
It's also a powder you can load in most pistol calibers.
'No Dot',,that's a term I've never heard of.
I used to use Clays for several yrs for my 12ga reloads. I found a nice easy load for the older guns. Then Clays got to be hard to find and I switched to Alliant 'Clay Dot'. That works just as well and i use the same bushing in the MEC for it.
Recently stumbled across an 8#'r of orig Clays in the pile of stuff that is my reloading supplys. So I guess I am set there.
I load 20 and ocassional 16ga with Red Dot. 3/4oz loads.
Lot's of RedDot loads in CF rifle. light loads using 10 to 12gr
4227 gets used in .401 WSL. I save it for that.
Still have quite a bit of Alcan powder as well. A 'get it out of my house' gift. Can't remember the Alcan #'s, but I did look up some data and remember that one was good for 38spcl and some 357 loads. The other was more useful for heavy payload 12ga IIRC.
Along with them came an unopened 10#(?) can of 4759 and a big unopened can of Herco (8#,,maybe?).
More powder is good powder...
I guess it'll all be usefull for something even if I never use 'em.