From reading your posts, it looks like the Powerbelts do pretty well with your inserts. My question is, how can you call it a good bullet when you have to modify it? That's like me saying that Ford ******s are what you should get if you want a race car, because they can be fast once I change the motor in them.
I think 98% of the world probably doesn't have the ability to, nor the desire to modify their bullets to hunt with. So why not choose a bullet that works well right out of the package?

That being said, when it comes to accuracy, I got very similar accuracy results to your 3 shot group with them touching there. They just shoot amazingly well, but they don't perform so well on deer for me anyway. Not saying that they don't for others, or with a different load, they just didn't work well in my load and from reading others posts, it seems like they have had a very similar experience, and I know several of my friends have also.