Re: case cap.
The three cases have almost the same powder capacity. The Ackley has a 40 degree shoulder and the Hart and Baer have a 35 degree.
I believe after having 2 of the 3 mentioned above that it depends on the Quality of the barrel, bullets and cases used and also the GUNSMITH who does the work.
Numbers of guns on line with the same chambering have a lot to do with it also.
Are you having a new rifle made at present?
Hope that helped.