What is this rimfire round?

[DLS]

A fellow was shooting a ton of black powder at an adjoining range. When he left there was a pile of .44-40 and .32-20 cases on the ground, plus this rimfire round. This case has a distinct "shoulder" about 1/4 up the body from the rim. Anybody know what it is? The dimensions are as follows:

1.449 long
0.336 diameter at the mouth
0.354 diameter above the rim
0.404 rim diameter

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[gunsmith007]

9mm. Rimfire blank would be my best guess but I have some harpoon gun loads that look a lot like the case you have but mine are centerfire yours could be older version

 

[TTSX]

I'd love to see a guy shooting harpoons at a range

 

[DLS]

Found it thanks to gunsmith007's hint:



Designed for use in the Winchester Model 36 shotgun. Size 7.5 shot at 600 feet per second.

 

[gunsmith007]

I will send you a pic of one of myhapoon gun blanks extremely rare so are the 9 mm. rimfire ammo saw one of those shotguns 25 years ago haven't seen one yet since