Those are some of the mind provoking thoughts I was looking for gear, so guess what I just had to do?...well.......try it out for myself. Using the original length of 1.260 and doing the same steps as before I only put in 10gr more shot and had some aluminum GC's and used it as the overshot card and the appearance of it was better but that isn't the point.
Doing it the way I did produced an AOL of 1.300 which for my magazine is really a tight fit but it did work. I put 1 in the chamber and 1 in the mag and went to the local range to see how well it would work, my range is out the front door. As before the first round fired but the case got stuck at the ejection stage and even trying to eject it was tough, seems the case itself is a bit to long. I don't have time right now but what I want to try out requires me to take off .100 to make the case 1.160 and use either #8 like I have been using or some #12 that I have and use sparingly.
Hopefully in the next few days I'll post a success or a failure but either way at least folks will know what direction not to take.