So have I. But, I didn't get to be an old dog by believing what I hear. LOL. So I stay on the cautious side of things and keep well inside the published specs. I did roll up some of those Barnes teflon coated copper jobs, but I eased back on the Reloader 12 to make sure I keep 'em under 2600.
I haven't fired any of them out of the SA, but I pushed a few out of an Ishapore Enfield I have just to check the velocity. They're right about where I want them, but I don't have any way to check the pressure curve.
So, they're just sitting there, waiting for a rainy day.
I am not an expert but, what I did was search long and hard for good information. I even talked to Springfield.
I only recall them saying this gun will take any load commercially available.