6mm is a perfect deer size game caliber. I set up a 243 Win a couple of years ago just for deer and Antelope. I live the caliber.
I worked up a great load for mine using the Barnes 80 gr TTSX bullet.
Not just a great caliber to start your son off on, but a lifelong caliber for him to use. For deer, hogs etc., in that size range there is no need to shoot anything different.
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