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I also agree that 58" REALLY short for a red oak bow at 28" draw. I would consider myself lucky to get a good shooter from osage at that length (or at least one that I would trust as a primary hunting weapon). As for hunting with a 68" bow, I do it all the time in some of the thickest woods on the planet. The eastern Indians hunted with long bows for a couple thousand years, as did the whole neolithic population of Europe. Unless you're like four feet tall, don't see how it would be a problem
A longer bow is more durable, usually smoother-drawing and more accurate. After you get some experience, you can start pushing the envelope on length and finding that fine line between high performance and firewood.