'03s with the "S" stock are hard kickers. My old daddy who shot them some in training with the SeaBees said the '03s recoil was stout and in the prone position brutal. An '03A1 isn't so bad thanks to the "C" stock. I have also found full size Lee Enfields to be easier on you due partly to the somewhat less powerful cartridge, a comfortable butt plate and a good stock design.
You are correct, Lyman, I shoot my '03A3 better than any of my other milsurps (my Garand is a close second followed by my No4 Mk2 Lee Enfield,) The 03A3 is mechanically very accurate, has excellent sights and a good trigger.