When my son was 12 I started him with a left hand Remington 788 chambered for the 6 mm Rem. The only bullet I loaded for him for deer was the 95 gr. Nosler Partition and he killed his first 4 deer with that bullet, all one shot kills. At 16 he switched to a 30-06 and has only used the 6 mm one time since then but that 95 gr Nosler is very effective.