The 18-Oct-2018 Team VTAC podcast features LTC Trey Lawrence, commander of AMU, and Troy Lawton, ballistics director of AMU. Lawton is a walking encyclopedia of ballistics and proceeds to lead one of the densest discussions I've ever heard regarding bullet design, cartridge design, coatings, twist rates, velocities, and numerous other topics.
If you have any interest at all in the current state-of-the-art of rifle ammo, this is easily worth the time.