I have a fourmla for a 1 7/8 oz 3inch 12 gauge load which calls for blue dot powder 31.5 grs charge win 209 primer one rem rp12 and I was wondering if I could you know put like a 5shot in it nickel or copper plated to make the ultimate magnum phesnat load is this possibole?

you can use #5's lead and or plated lead shot in your load. just I would not recommend using any buffer unless it is specified in the load data. good luck