I think, but dont quote me, that the recomended "MAX" length is about .010 less than the actual MAX length of a standard chamber usually. Like you said, you have soem thats over the reccomended max that still feeds. I would imagine if they get to .010 over that max youll start to see problems.
Before I new anything about neck trimming I reloaded brass many times without ever even thinking about the case length with no problems but now that I know I try to keep it all under the reccomended max if for no other reason than to make it all consistant.
SO, a little longer MAY work just fine. A little shorter WILL DEFINATELY work just fine. Better safe than sorry. I think I'd rather do a little trimming and be consistant and SURE it would work than one of these days getting too long and having a problem or best case only having to pull a bunch of bullets and redo it again.
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