Big Joe, if the rifle is competition grade, the brass is match grade and the bullets are match grade, AND you shoot in competition...then, yes, a competition die set makes a difference.
Otherwise, not.
Here's an analogy that's timely: The Indy cars this weekend all use "racing grade" tires. Would those tires "help" on your car? Yup, if your car went 225 miles an hour, and you were willing to buy new tires when the racing ones wore out - after 150 miles.
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