I have had the great fortune this year to be-friend the son of the owner of a great custom gun maker. With this friendship came the benefit of me being bit by the custom gun bug. That being said, I would like to build a mid range (out to 500 yd) short action rifle for my son for hunting/targets for his birthday. My wife, also a competition shooter and hunter, and I have kicked around a few calibers, 243 AI, 260 rem, 6xc, 6.5x47L, 6.5x55GWI, and one of the RSAUMs. Looking for something with a lower felt recoil but enough oomf to take a deer at mid range once I am comfortable with his shooting those distances. I prefer to stick with a 6mm/6.5mm/7mm. What are your thoughts/suggestions?