I stand by my post. If you're displacing metal, it has to go somewhere, and from my measurements and experience, that "somewhere" doesn't help performance.
The solution is neither exotic nor expensive: If you want to roll crimp, buy bullets with a cannelure that are designed for a roll crimp. There's a good reason why they have a cannelure - a feature that requires an extra, more expensive manufacturing step - that reason is....
are you ready?...
Because a roll crimp requires it. If Lee was right, then no bullets would have a cannelure.
Lee does a good job marketing their products. They don't perform as well as others, but their customer service department at least will replace them
quickly.