Firing was no problem. It is the reloading with five or six in the mag. I tried both methods, slingshot and lefthand-on-slide, and both result in the nose of the rnd jamming solidly against the feed ramp and stopping.
I did the slow motion thing and did see the dipping of the bullet as it was being stripped from the mag as the bolt came forward.
Today, I am doing some polishing of the ramp.. that has worked for other guns with the same problem, notably a few 1911s I used to compete with a few years back.
Since a lot of feeding problems with SAs tend to be mag related, I have wondered about that as well.
Thanks for the reply, I'll let you know of any developments.