Why would that be max length already? You have the entire length of the neck and depending on the cartridge that can be a lot of room to work with. As the throat erodes you chase it. By the time you run out of neck it's probably time for a set back at least, maybe a new barrel. Keeping the bearing surface above the neck/shoulder junction seems like a good idea to me, it's generally what I base my specs on when I order reamers.
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