I loaded some Berry's hollow points up for my 9mm. The bullets shoot great and I never had a problem. I did recover one and the bullet did not expand at all. It was almost in the same shape it was before I shot it, no change except for stained and rifling marks. This bullet was fired into a very soft stump. There was a plug of wood stuck in the bullets nose (cavity).
I load, 9mm Luger, 38 and 40 S&W, 38 Special, 357Magnum, 45ACP, 45 Colt, 223, 300 AAC, 243 and 30-06