I own two Auto 5's in 16 gauge. One is a Browning Sweet Sixteen, and the other is an Auto 5 made by Remington in 1943 when they were making them for Browning due to the FN factory in Belgium being occupied by the German's during WWII. The other is a Remington 11-48.
The 16 is so well balanced, the power of a 12 gauge and the handling of a 20 gauge. I have never understood why the 16 doesn't get re-introduced by one of the major manufacturers, & with a 3" chamber would be even better.