62 year old recreational shooter and handloader. I have been shooting AK for over 30 years, but brand new to the AR platform. I have loaded for my straight walls, [32ACP, 32 H&R Mag, 38 Spl, 357 Mag, 45ACP and 45 Colt, also 20 gauge and 12 gauge] but never for bottle neck rifle cartridges.