Flare part?

This came with a cartridge collection. There is two of them identical.
Someone suggested part of a flare.
Made from brass.

Length is 44.45mm
Outside diameter 12.74mm

I am assuming it is bored through. If so,it is a measuring spout for a modern black powder flask for muzzle loading firearms. CVA, Thompson Center and many other company’s make them in a variety of sizes and adjustable types also. Not a cartridge case.

pictures;
https://www.trackofthewolf.com/Categories/PartDetail.aspx/71/1/SPOUTS

Joe, are you sure length is 4.45 mm ?

Alex,

Fixed typing error, 44.45mm length.

Joe

Measuring spout for a modern black powder flask it is.

Thanks!

Joe