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One way of looking at it:
The bullet may start out oversize,but passing through the leade into the rifling it will be swaged to not over groove diameter. After that,it is a groove diameter bullet.(assuming lead core,copper jacket normal bullet)
A question might be how much pressure does it take to swage the bullet to bore diameter. Good question,I don't know.
But once again, as soon as the bullet is swaged down,its no longer oversize and so.IMO, should not bump up pressure beyond whatever it took to start the bullet into the bore.
Its a different set of rules if you are pressing a case hardened steel dowel pin into an undersize hole.
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