Well, a little while ago I bought an M1 Super 90 Field model (28" ribbed barrel, 3 round magazine tube, bead site, NOT the prohibited model). The issue I'm having with it seems to be the opposite of the normal problem the older inertia driven Benelli's are known for. It cycles low brass junk bulk #7.5 available in the 100 round cases from Wal-mart like a champ. Never has a single stoppage feeding Winchester or Federal low brass target ammo. However, it consistently fails to feed high brass higher dram shells like buckshot and slugs. Always a failure to feed. Anyone have any ideas on how to fix this?