Gcarlton, It is to overbore and not as effective as you might think. When a cartridge gets to overbore it just loses efficiency. Kirby's 7mm is about as big as you can go. The problem is bullets are not designed for the velocities you can achieve. We did one when I lived in Colorado and I can look up the numbers for you. It was very accurate but we had to use solid bullets like Barnes in it or slow the twist down to where long vld bullets would not stabilize. With faster twists it just blew up bullets. We did get some 175 Sierra game kings to shoot in it at around 3450 fps. The imp lapua case I think is about the max in 7mm. From my experience with this one I would not do another.
Predictions are difficult, especially when they involve the future