The 20 is just as effective as the 12 now days. Most of the 20ga sabots are pushing the same velocities as the 12, just with a lighter slug. A 260grn slug in the 1900-2000fps area will be devastating on game. It will be just as effective as using a modern inline MLer with sabots.

Big advantage to the 20 is less recoil. A 12ga is tolerable, but HV slugs recoil much more than a magnum rifle.

loder