I competed with a full match SA M1A at 200 and 600 yards. Honestly, I couldn't get the M1A to shoot with the black rifles so I went back to the AR-15. I thought the world of that rifle but finally sold it to a friend. I owned it for 10 years and sold it for what I paid for it.
That was my experience and others may have seen the M1A differently. I CAN state accurately that M1A's seldom appear on the firing line at matches. One good thing, I never had a problem finding my brass among the littered .223 hulls!