Yes I have...I have also shot some 2 moa springs and one 1.25 moa NM springer...and that was the best one I've handled. I have been told many times that an NM M1A will do under 1 inch but I have never personally seen it, although I don't doubt that it happens.
In my experience, 6 moa is about what you can expect from a SOCOM, although I have seen them do four.
I am not down on springfields, I am just not especially impressed with them. I am not a Norinco fanatic - I would much rather own a really nice US built semi-auto version of the M14. But that wouldn't be a springfield, it would be an LRB. I could afford it, for sure...in fact I could afford it without stepping out of my checking account and into my savings! but that is big money for something I don't need, especially when I already have some very effective norks.
So while some guys might not understand not buying something you can afford, I guess I am just frugal. Maybe that's why I can afford the stuff!
But at any rate, don't take my word for it on the springfields...as previously mentioned, why not go to the Firing Line m14 forums where there are a ton of people who own springfields and can give you a better idea of how they perform.
I think if you ask around on there you will get the same basic numbers that I have given you...about 2 moa for standards and 6 for socoms, and approaching 1 for NMs.
Well, I have never had any difficulty getting under 2 with a $400 norinco with $200 of parts on it. And they have all been extremely reliable. So if you want a more expensive gun, get one...I don't feel the need!