.224 should work and has been for you, the old rule of thumb of bullet diameter is a sound practice but there are a few cartridges that do not meet that "rule" that have enjoyed commercial success if I recall correctly, of course those are not from seating depth but neck length.

If you like that load and it shoots well then I would just keep on shooting it.

If the length you've been using is what works, don't change it for some arbitrary "standard" with no basis in fact. Some guys are loading hunting ammo with much less shank in the neck than you are, and do fine with it. IF you should discover that something is screwing up your ammo due to shallow seating, THEN address it (which might mean nothing more than changing the way you carry spare ammo, for instance). Otherwise you may be compromising your accuracy to cure a non-existent "problem."

That is one of the ones I was thinking of. Not going to look it up on the phone but isn't the 300 Win Mag also shorter necked than .308? There are a few others.

Whoa! That is one short neck!

It fathered a phenomenon.

Would that be 308?

6.5 Creedmoor