I have been looking at the Leg Notch Harris Bipods and I can't decide on the 6-9 or 9-13 inch bipod. I will mainly be using this bipod from the bench and prone position. I have a stoney point monopod that I use for sitting. I haven't used a bipod before and just need some help with picking the right one. I will use it mainly for my Savage BRJ 22 and possibly a Remington SPS Varmint. Please help with any insight.