The OAL thing is really for repeaters unless you are loading all the way up to max case capacity for a bulky powder. If you stay in 'middle' of data there will be no pressure issues due to seating the bullet a tad deeper. The only powders I use that completely fill the case are Black and TrailBoss, all my other smokeless powders leave an air gap within, at least at the power levels I can stand. Your real max length is governed more by the bullet's ojive, that is, not all bullets of a given weight have the same nose shape. A long, more tapered ojive will clear the rifling whereas your bullet bumps it and wants to seat in farther.
If you 'must' crimp and the bullet is too deep for the mouth to meet the case rim, just trim the cases shorter to make them match.
FWIW, if the case neck tension is enough to hold the bullet from pulling out easily, there is really no need for a crimp in a single shot rifle, unless you have proven without a doubt that your combination of components shoots better groups with a given amount of crimp (a long a tedious process to do properly, but some like doing it). For me, I experiment until I get what is good enough for me and then just keep duplicating it
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