I also use Alliant Red Dot in my 12ga. trap loads, and it's never let me down. The only other Alliant powder I use is 2400. I use it in .357, .45 Colt and .44 Magnum loads for both rifle (Winchesters) and pistol, and I also use it in cast bullet loads in 7x57, .303 Brit, 8x57, 7.62x54R, 30-30, .308 and .30-06 rifles. I love the stuff. Also, I'm old.
The only Alliant products I've never liked are Bullseye and Blue Dot. I've never been very successful with either.
You mentioned that you've got a 629. I load 8.5 gr. of Unique over an RCBS 44-250-K(ieth) which gives 1005 fps out of my flat-top and a friend took an elk (very quick and humanely) last season in Idaho with one of those loads in a Marlin lever gun.
I do have a 629, but as I think I mentioned, it's a Power Custom Grand Master, so I really baby it with light loads, even though I really don't need to. If I'm looking to fire "manly" .44Mag loads, I use a Ruger Redhawk. Thanks for the info.
Mark