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black 3" shotshell hull
remington, remington headstamp,sportsman highspeed steel hull 1400-1 1/4-bb max 1050 bar 76mm.12ga 3in can it be reloaded with longshot powder, win209 primers, waa12f114 wads, 1 1/4 thru 1 5/8 loads #5 or #6 magnum lead shot, has plastic yellow base wad
the best advice i can give here is to measure the internal volumn and compare it to known cases.
remington has about 4 different case volumns out at any given time.
in fact federal and win do the same thing.
i found this out the hard way [like most everything else]
but measure the internal volumn so you know where you are starting. then do the work-up like in metallic loading.
it's worth the hassle, if the hulls are any good.