Lowest recoil round?

[B.L.E.]

Yeah, I have an antique adjustable dipper that is marked for oz of shot on one side, and drams of powder on the other.

I use a plastic Lee adjustable shot dipper. When it's set to measure 1 1/4 ounce shot, it will hold about 85 grains of black powder which is a little over 3 drams.
A lot of the muzzle loading shotgun shooters I shoot with use those Lee dippers to measure both powder and shot, an equal volume of shot and powder is considered by many a good starting point.

 

[Rifletom]

Why not just try some of the lightest, lowest velocity low recoil rounds available in said shotgun[that fits you properly], and see what actually works.
What works for one shooter, may not work for another. Trial and error and lets see what you come up with.

 

[Bluecthomas]

I got a Marlin 39a, can't hit a soda can at 10' with shot shell .22 in it. Stuff works fine out of my .22 revolver.
But in a well rifled long gun, useless.

Target load lowest recoil 12g I've tried. Federal has a low recoil slug it's suprising easy on shoulder.
Haven't tried any low recoil buck.