You won't find a four gauge box with a smokeless load of a powder that is made today. You have to make up your own loads. It will be hard to blow up a four with sensible loads. It is hard to blow up an eight with loads that work in a ten plus about ten or twenty percent volume of powder. The problem is keeping the pressure up in the big bore. Just to be honest, I use my fifty years of loading twelve gauge shells, add the ten to twenty percent fast powder to make light loads in the ten, and don't progress to slower powders like Unique or Blue Dot until I want to load heavy loads in the ten or the eight. Even then, I go to the 12 gauge loading charts for my slow powder loads in the twelve gauge and add 10 or 15 percent for ten and eight gauge loads. The "big hole" makes the loads safe. Don't fall for the "boutique powder" trap. Use the cheap stuff we use for our other shells, like Red Dot, Unique, Blue Dot, 700x, you name it. Forget the powders that no one can find.
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