REMINGTON 300 WIN MAG AMMO FUNDAMENTALS EXPLAINED

Would any of you Remington men understand how the earliest Wingmasters as compared to ones manufactured later?I did not realize that anyone could load a shotgun Incorrect. Did you know of any superior resources for 870 Police trade ins? I even now want tot make up a tactical shotgun.The serial selection has 5 digits as well as the W suffix, no pref