i'm against using buckshot in anything other than a 12 guage (for deer). i would caution against using it in a 410. if you are determined to let your son hunt deer with his 410, get a couple boxes of slugs and shoot the gun to see how accurate they are at various distances (25,35,45 yards, etc.) let the boy shoot the gun to be sure he can handle it and shoot it accurately. only then would i allow him to hunt deer, and then i'd instruct him to hold his fire until i said so (as in the deer moved to within the distance where the boy was accurate).ymmv......