One of my crow hunting Buddy's who is a great shot use's Rio shells. He misses like one out of 10 crows and we always say "blame it on Rio" Built in excuse for missing what more can you ask for?
Hammer
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"Any man who can successfully kill crows can hunt any game bird in the world with success" Hammer 2008
I've used RIO for duck and dove, and never had any complaints. This may not be true, but someone told me they are the most commonly used shotshell worldwide, they just don't have much of the US market.