If you are pulling 70 and want to lower, I would go about 65. You are not going to lose very much fps. Not even enough to matter. You will still get plenty of penetration. Plus you will be able to draw back easier when hunting. You may have an awkward sitting down shot when you would need a little less poundage. I shoot sitting down when I hunt and I went from 70 to 65. The 5 pounds made a big difference for me. I lost hardly any speed and no penetration.