I will note that Federal was the last major US maker of shotshells to abandon the roll crimp & adopt the pie crimp. I don't recall the exact date but i believe it was at least sometime into the 1960's. I do recall that when I first became interested in shotguns in late 1954 & for several years thereafter Federal was advertising their "Frangible" top wads which disintegrated upon firing so as not to disrupt the pattern. These wads would no doubt show confetti on firing, which they were intended to do.
