I'm sure you know that Trail Boss was designed for pistol and rifle loads. The one thing they do warn about is compressing the powder. That is a no no. It breaks the donuts up and causes a quick spike in pressure. I found the following at this link
ttps://tinyurl.com/yjzjt8he
Follow the link and decide for yourself.......and as with all "Off label" uses, try the smaller quantity first.
"I have been trying Trail Boss in 12 GA. shot shells and it works well for me.
2-3/4" win AA Hulls
7/8 or 1 oz, WAA12SL wad, 14.00 Gr. Trail Boss, extra light recoil & a clean burn.
7/8 or 1 oz, WAA12SL wad, 15.00 Gr. Trail Boss, very light recoil & a clean burn.
7/8 or 1 oz, WAA12SL wad, 16.00 Gr. Trail Boss, light recoil & a clean burn.
7/8 or 1 oz, WAA12SL wad, 17.00 Gr. Trail Boss, medium recoil & a clean burn.
7/8 or 1 oz, WAA12SL wad, 18.00 Gr. Trail Boss, medium recoil & a clean burn, case is full and this load does not have enough pressure or recoil to operate my Mossberg 930.
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