Although it was an 870 Express, there is a big difference in quality than the 870 Wingmaster. My Express wouldn't cycle Remington steel headed promo loads but ironically, it would cycle the steel headed Winchester promos. I no longer have the Express. Tom Armbrust no longer tests factory loads. Perhaps he was concerned about someone mistaking test results to the point where they inferred it covered all runs of the same designated shell. As Ted noted, batch to batch can differ. Gil