I'm wanting to build a lightweight whitetail rifle. 22" barrel or less. I don't reload and have no idea what caliber I want. Need help on a light recoil rig and don't have a full understanding of the different powders and what would get a complete burn in a short barrel. Concerns are: light recoil, flat trajectory, and I want to be able to shoot up to 500 yds - all in 7 lbs or less.