I am a recoil sissy and cannot shoot well with anything that bucks more than a 270 or so. I also have 10 grandchildren who I want to teach to shoot and hunt whitetails here in the south. I am thinking of building a rifle of medium caliber using the 7.62x39 case. I have heard that the 6.5 Grendel can be formed from 7.62x39 but have not been able to confirm. Any suggestions ?