I sold my 870 slug gun when Winchester dropped the Hi Impact Supremes (BRI style). They really shot well and hammered the deer. My brother in law shot regular Winchester BRI and they left a weak BT, deer ran a ways.
His solution was to keep shooting the cheaper version, but let them get to 50 yards or closer and shoot them in the head. He ran a M500 Trophy Slugster and did not buy his ammo from one lot #.
Worked OK for him though.
Actually, I had two 870's drilled and tapped, running rifled bbls. The first one my cuz still has.
He missed a deer with it (I never did) so sometimes bring that up on the drive to our hunting spot
