Re: Overall length what is too long?
Overall length of the rifle is up to your taste. Overall length of the barrell finds most barrels under 32.5 inches, although there is room for improvement on large cartridges that spit most of the powder out the muzzle, like the .284 Win Mag. I'd love to try that old barrel burner out at a longer length!
Overall length on individual cartridges are defined when the gunsmith drills the bore out with the form cutter for that specific bullet. If you load one longer that the hole by a couple of thousandths, the bolt will compress it. This could be very dangerous, resulting in an unintended firing with the bolt not locked down. A thumb is sometimes broken when the bolt comes flying back if it is left above the helix, but the guy down range is the unlucky one.