My new build 223 will be arriving on Tuesday and I plan on reloading for it. I will be Prairie Dog shooting with it. How many .000's should I be backing off the lands. It is a 1 in 12 twist and I will be shooting 50gr. V-Max's. I have never reloaded for a 223 before. Any thoughts and advise will be appreciated. It sports a Joel Russo stock so pictures will follow, the 2 year project nears completion. Dale