I am curious about the 7.62x39 caliber. Is it sufficient for deer hunting? I have heard of it for years but never seen one up close. It was originally a military round correct? I am looking for a decent 1st rifle for my son and have been looking at the 243 caliber rifles. Yet when I see the pricing on 7.62 ammo I am thinking it may be the way to go. Anyone got any helpful ideas or suggestions?