545x39 vs 556 vs 300 blackout vs 762x39 PT1

Wanted to do some penetration tests with some of the different calibers for the AR15 Platform. 5. 45x39 5. 56 300 Blackout and 7. 62x39. Ran them through a series of tests including a 3gal water jug, wood blocks, car door, cement blocks and steel plates. Got what we expected for the most part. But did have a few surprises along the way.