While not exactly the same- I have been making light target loads for my 500 S&W magnum with Trail Boss. It works very well for low velocity rounds and burns relatively clean. I believe there is load data for .44 mag on Hogdon's and IMR's websites.
Trail Boss allows the lowest possible velocity to be safely loaded in magnum handgun ammo if that is your goal. Consider this to be the exact opposite in use as H110 or Lil'Gun which are used exclusively for very "hot" loads.
If you buy a container of Trail Boss you should note that because the powder is so bulky, you will only get 9oz. in the standard one pound container however the price should be reduced slightly to reflect this. This bulkiness allows a light charge to nearly fill the case for excellent powder positioning.
light loads are what I am after, the load data I can find shows 6 grains of trail boss for 950 ft/sec. I am going to load some up in the morning and see what they look like at the range
I've been loading Trail Boss in .44 Mag.
I use it under a .060" vegetable fiber wad and a Hornady 240 grain SWCHP. I HATE scrubbing lead out of my barrels, that's why I go with the wad. I get virtually no leading where a .44 special factory 'cowboy' load will lead badly.
My .44 is a 9" Encore with a Trijicon Reflex sight and this load shoots 1-1/2" at 50 yards from a rest.
I meter it with a Redding 10X measure.
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