Did helicopter hunt once before with an AR north of Hondo! One of my most favorite events ever!!Any 7 Mag pill will take em out from just behind the shoulder and forward. The real long range shoots are not common unless he is going somewhere where they are set up for it, I 've taken them out to 300 with my Grendel and 700 with the 257 Bee.
If he wants the ultimate experience, hunt em out of a helicopter, I can think of only one thing that is more fun.
Ilse Helicopter Service, El Campo Texas, he has contract with the Rice Co-Op and the rice is flowering this month and the hogs just love it. I took 73 in about 1.5 hours year before last on July the 15th
Most fun I had was with a supressed AR 300 blackout shooting 208 grn subsonicsOh yeah….If you can or have one available, I would pass on the 7 mag and pick up an AR just for the follow up shots. They are almost always in a group and bolt actions are slower than semi autos