Took my 535 back out today and had much better results after a good deep clean.
Mossberg X factor .670 put 254 pellets in a 10" at 40 yards.
Carlsons Longbeard XR .660 put 283 pellets in a 10" at 40 yards.
Both results came from Winchester Lingbeard XR 3.5" 12 ga #6