Old Ammo

[C.O.B.]

Recently I found a box of Remington Kleenbore Nitro Express 28ga paper shells. These are loaded with 3/4 oz of shot. The thing thats puzzeling is that these are 2 7/8 inches in length. I have a box of Peters Target loads also 28ga that are 2 3/4 in length and 3/4 oz of shot. The Remington shells are green while the Peters are blue. Both are paper hulls.

Is the difference in color due to RemingtonVS Peters? When were 2 7/8 length produced? Another difference is that the Remingtons are roll crimped while the Peters arn't.