Zike: my experience has been with the 30-06, 308 and the 7.5 Swiss.
The length of the plug is long enough to reach to the bottom of the neck on all 3 of those without getting into the flare area (safe amount)
I change the setting to suit the difference with a micrometer keeping it well away from the flare so a bit over or under is not an issue.
I don't know enough about them to know if a .257 is not long enough.
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