Most people use right helical only because tips have a tendency to unscrew when they hit a target using left helical. That would be the only issue involving a drop away rest (or any test for that matter).
it depends on where you live, if your in the southern hemisphere the right helicle will go down the toilet spinning the other,,, oh ,,,wait,,,nevermind,,,,
actually i have never been able to tell the dif except on my long bow.
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