RE: Case overall length < recommended--effects???
I only have one rifle that I can seat the bullets out anywhere near the lands while allowing the cartridge to work in the magazine or the bullet to actually be seated at all in the brass. Just seat the bullet so it functions in your magazine, and don't worry about it. You might lose some accuracy that can be had by seating closer to the lands, but I've found that using a Lee factory crimp die helps gain some of this lost accuracy back.
Alcohol, Tobacco, and Firearms... who's bringing the chips?