Very interesting results by LRHG. If a bullet tumbles in a media, it is, by definition, unstable in it. This is true regardless of whether the bullet expands, sheds petals, or remains intact and undeformed. When a bullet tumbles, a slow twist is the obvious first suspicion. Especially since a 214g all-copper bullet in .30 cal is a very long bullet.
However, LRHG assures us that the twist is within specs. But, without more than his word on twist rate, and, in light of all the successful Hammer bullet testing and testimonials, especially tests showing that an under-spun Hammer bullet does exactly what is seen in LRHG's test, a lot of people are going to question LRHG's test.
A couple of shots into ballistic jell is a good start, but hardly is the final word on the terminal performance of a hunting bullet. I hope LRHG does more testing and shares his results. Different bullet weights and a couple of other rifles, especially with a faster twist, would be helpful to make his case if he still wants to conclude that Hammer bullets have bad terminal ballistics.