With experience and study one can lean what fits and what doesn't and if one understands what is going on, one can compensate to a degree.

Without this, a gun which shoots where the shooter does not think it does is going to make him miss more shots.

You can and must compensate for fit - when changing from thin to heavy clothing for example.

If the drop is wrong, you will be shooting the legs of your birds or shooting over them. hopeless if you don't know it.

As range increases, fit matters more.

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