Looking at both the Anzio 50 and the BA50 at the moment, trying to get some real world reviews on both if possible.

Wow this is old and my response might be a waste of time but....

Mike at Anzio is a great guy and a real smart dude.  He's decided the 50 market is saturated and is focusing on his 20mm rifles at the moment.

Feel free to reach out to him though as he might be doing one off custom work.

I owned a Anzio single shot 50 similar to this http://www.anzioironworks.com/Anzio_single_shot_50.htm

It was reliable and simple.  No complaints.   It would hold the 7 ring at 600 yards with ball but I didn't do any real load development and also haven't shot anything else to compare it too.