I suspect it's not an AR as in his sig he has a browning Abolt in 243 wssm.
If the primers are even with the bottom of the case you should be fine.
If the primers stick out of the bottom of the case you need to seat them deeper, apply some more pressure.
Easy check, set your loaded ammo up on a flat surface. If they wobble around because the primer is out that's bad. If not, they are fine.
