NO NEED TO USE 3" SLUGS, JUST USE THE 2.75".

THE BARREL IS A FEILD MODEL TYPE, NOT A RIFLED BARREL?

IF ITS A FEILD BARREL AND YOU HAVE SCREW IN CHOKES PUT IN YOUR IMPROVED CYN. CHOKE, SIGHT IT IN USING REGULAR FORSTER TYPE SLUGS, USING THEM IN THIS SET UP IS BETTER THEN USING THE SABOT TYPE SLUGS WHICH WORK BETTER IN RIFLED BARRELS.

I MYSELF NEVER HAD LUCK WITH REMINGTONS FORSTER SLUGS IN MY SMOOTH BORES, BUT THAT WAS MANY YEARS AGO, TRY WINCHESTER, FEDERALS.

GOOD LUCK.