I do remember reading years ago about a 303 with a Brown Fibre substance exposed and crimped at the mouth of a Blank 303, now I have one and can not find where I read it , the headstamp is E C 11 probably a reloaded ball round , the mouth is closed with a 6 point rose crimp with the fibre extending just out of the mouth ,I am sure its a Factory round ,but why ? Thanks Randy
Have you got a photo Randy?
Just based on your description, it sounds like it is a blank where the fibre over charge wad has not been placed deep enough in the case and when it was crimped the wad has been pinched and is now partly outside the case. However, that is just a guess.