There's been a lot of rumor about this for the last 4 or 5 months. Right now, it appears that they are leaning toward stretching John Linebaugh's Maximum by just a tad (so they don't give him credit for it, I would guess). At any rate, Lloyd Smale has a thread a Graybeard about it.
http://www.graybeardoutdoors.com/phpbb2/viewtopic.php?t=3784
Now, I've shot the 500 Linebaugh quite a bit and it isn't the most fun thing in the world to do. John L and Hamilton Bowen both recommend the standard Linebaugh loadings to the Maximums. Bowen won't make them anymore because he absolutely will not test fire them.
http://www.graybeardoutdoors.com/phpbb2/viewtopic.php?t=3784
Now, I've shot the 500 Linebaugh quite a bit and it isn't the most fun thing in the world to do. John L and Hamilton Bowen both recommend the standard Linebaugh loadings to the Maximums. Bowen won't make them anymore because he absolutely will not test fire them.