First of all you're not doing it any favors shooting modern shells out of it as it most likely has chambers between 2 1/2 - 2 9/16 inches. When it's fired the crimp will open up over the forcing cone raising pressure drastically. There's no difference between high brass and low brass. There used to be but not for many years, now high brass is a marketing ploy. That's not a serial number, it's an assembly number.
yeah......had to tighten and reset the action when I got it.........it does fine on low velocity (what we all call low brass around here) #1 buckshot......the barrels are steel, not twist.
funny, Dixie Gun Works didn't mention it was an assembly number when I asked them to date it for me a couple decades ago ($10 charge for that).
anything else chapping you about my shottie?
nice old shotguns you have btw.........I gotta get my '97 Winnie back from loanout someday