I too have had trouble getting Remington shells to pattern worth a darn in a BPS or 11-87 (both 12 ga), with any choke I have tried. Not sure why, maybe softer lead leading to more deformities and fliers. Maybe a lack of buffer???
Anyway, I moved on to other brands some time ago. Sadly, I have a stash of old Rem "Wingmaster HD" htl shot that is taking up space in my closet.