I also have a full box of vintage 16ga loads someone gave me--but not vintage enough to be 2 9/16". They're standard Peters High Velocity loads, pretty obviously for pheasants: 3 1/4-1 1/8-6 shot. Promoting the "new Peters crimp". Playing detective a bit, the best clue I can come up with for the age of those shells: The address for Peters Cartridge Division on the box lacks a Zip code--and they were introduced in 1963. So I'd guess older than that.
1963 is the year I graduated from high school. That was also the year I replaced the .410 Stevens single shot handed down to me by my brother with a Savage 420 OU in 20ga--and thought I had some serious firepower. So would have been focusing on 20ga shells back then, not 16's.
Last edited by L. Brown; 01/17/19 06:29 PM.