Dan from BullShop will size them to anything you ask. He also has a couple of differnt lubes he offers. I take the lube made for black powder. I've had good luck shooting the 460 grain and the 500 NEI. I have only shot a few of them out of my Renegade with the 1-28 twist and really do not remember the circumstances.

I will shoot some tomorrow out of the GMB and see how they shoot... Feel free to e-mail him and ask him anything you like. He's quick to answer..