My 10 year old son and myself went to our first F/TR match at our local club this weekend. He was going to watch and I was going to shoot. Well, someone volunteered a spare .223 and he shot, and did well. He actually beat 3 or 4 adults. What are some suggestions for a good rifle for him to start with? He can shoot a 308, but not 40-60 times so it will be limited to a .223.