RE: Uphill / Downhill shooting
TXHunter and CalNewbie are correct, shooting at steep angles either up or down will cause your bullet to strike high. It is basic geometry and physics, hypotenuse of a triangle = less distance = less time for gravity's affect on trajectory. I can give a real life example that just happened three weeks ago. I was sighted in dead on at 100 on the range, went hunting for a blackie and he was 220yds up a mountain. He was turned and had head up hill, i put right on spine and was dead on at 220. If it was flat, that same shot would have hit him in the rear.