Ok, I wanted to know if I could do it. Yep, I jusy don't recomend the mag loading if you can help it. Put the mag in the crook of your arm (bad hand) and support the bottom with your ribs. Now you can shove some more ammo in the mag. The first five weren't bad, but getting that last one hurt the ribs! But I got it all 15 of 'em.
The mag was no problem. Flip the gun upside down and stick it between your knees. Mag seated.
To chamber a round, find the nearest hard flat surface with an edge, hook the front site on the lip while pushing down on the gun, quickly pull gun towards you and off the lip to put one in the tube.
I am going to try and get to the range tomorrow. I will let you know how it goes.