Stevet,the rational thing to do is a7mm Dakota IMP. like Kirby did with his 6.5AX. Lots less work involved to form the brass.
The reason I did it the hard way was so my bolt wouldn't have to be modified. (you might want to go back to an Ultra mag some day) Either way it's a very efficiant case.
It will be interesting to see if it can perform well with the heavy VLDs (168 to 200gr) It has easily produced higher velocities than the 7mmUltra mag with the 140gr ABs and 80grs RL22 Whether it can do that with the smaller cap. and heavy bullets remains to be seen. email@example.com