Hm. Are you absolutely certain? I was looking and my bolt definitely goes farther back than the factory mag was designed to accommodate. There is about a quarter inch of unused space at the back of the factory mag, which is kind of annoying, but it looks like the bolt slides far enough to engage...
So I happened upon a Tikka T3X 7mm-08 on sale at a local gun shop and I snatched it up. I took it to the range with a box of ELD-X ammo and the accuracy was pretty lousy (2 moa), but I reload so I wasn't put off quite yet.
I picked up a box of 139 gr Barnes LRX and checked the seating depth...