For whatever reason, similar loads from different manufacturers can have "holidays" in the pattern that a bird can fly through. Patterning is the only way to find out.
Remington might be evenly spread throughout; Winchester might have holidays. Or vice versa. And it can vary between identical shotguns.
Example: In my Model 12, Win high-brass 3-1/4 x 1-3/4 loads patterned nicely in the 30" full-choke barrel. I changed to a 26" improved cylinder barrel, and that same load has holidays. But, with Win low-brass 3-1/4 x 1-1/4 it patterns uniformly.
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