Ray is a great guy to deal with! I bought the scope from him and not only was it better than described & photographed, but the man definitely knows how to pack stuff for shipping! Deal with confidence!
The most simple answer is that 1 moa is approximately 1" at 100 yards -- 2" at 200 yards ---- 3" at 300 yards etc. That isn't the absolute 100% correct answer but it'll work for trap shooters.
So when he says it will shoot half-moa he's basically saying the rifle will put 5 shots into 1/2" groups at 100 yards ---- into 1" groups at 200 yards etc.
All this assuming a competent shooter.
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