I have a box of 16ga Winchester Repeater Paper Shot Shells loaded with Smokeless Powder. These are in a two piece box with a load of 2 Dupont & 1 Ounces Shot N0 7Ch, load # R61D7C. It carries no warning about Damascus or Twist bbls.
On a sticker on the bottom is;
CAUTION
Do not expose these shells to extremes of heat or moisture. Shells loaded with Smoeless Powder will withstand ordinary climatic changes but will vary in strength if exposed to abnormal conditions.
Winchester Repeating Arms Co.
It then lists patent dates of June 9-30, Dec 8 1896, JUly 17 1900, July 14 1903.
These shells havve Yellow paper & measure 2 3/8" loaded with roll crimp, so should open to about 2 9/16 upon firing.
Miller
PS; The Caution on the box is in Red letters.
