Do we have ANY stand up, one or two hand shooters that CAN shoot (regularly) 2" groups at 50 yards, no bench, no rest?
When my eyes were better and I was shooting more, I could, on occasion, shoot a 5 shot offhand group at 25 yards that would run around 1.5".
Not consistently, but every once in awhile. Theoretically, that would make groups between 3 & 4" at 50 yards.
These days, if you let me shoot 3 or 4, five shot groups at 25 yards, I could probably manage one that would run a little under 3" and a couple in the 3.5" range. I haven't shot a 25 yard group under 2" in several years.
High Master bullseye shooters hold 4 inches or less at 50 yards in the slowfire strings with a one handed hold...
One would logically assume that they could better that slightly with a two-handed hold.
The Bianchi cup targets are shot at distances out to 50 yards, and the match is typically shot clean by the winner. The 10 ring on the Bianchi cup target is 8" in diameter which tells you that the top shooters in the Bianchi cup matches can hold an 8" group out to 50 yards.
The X count for the winner is usually up around the mid 180s out of a perfect 192. Since the X ring is 4" in diameter, that tells you that no one has ever been able to hold a 4" group for the entire Bianchi cup, but it does tell you that the top shooters would be able to shoot you five shot 4" groups @ 50 yards (and probably smaller ones) with no problems under less demanding conditions.
After all, the Bianchi cup involves shooting moving targets and some fairly tight time constraints, not just seeing how tight you can make your groups.
All that to say I wouldn't instantly call foul on someone claiming to shoot 2" groups at 50 yards. It's not impossible, but it's also not something you see every day. I'd want to see someone like that shoot, even if I had to pay the range fee and provide the ammunition. It would be an experience and a story worth telling no matter how it worked out.