Why would this only be a problem with pumps? I can understand the reasoning, that an auto is more forceful in its ejection, but I have never seen a pump jam on promo target shells. In fact the only pump that has ever jammed on me was a BPS. The chamber was out of spec, but it still only jammed with 3" mags, no matter the quality of make.jlptexashunter said:The biggest problems are with pumps (remington 870 express, winchester 1300). The crappy metal header on the shells swell and get jammed in the gun until they cool off enough to eject.