What's the case capacity of the 28 Nosler ?
Per recent articles, the Nosler has a capacity of 99 grains of water.
Fully formed Mashburn cases (mine) held 90 gr H2O to top of neck.
As Docbill points out the Mashburn case has a longer neck than a 300 WM case. It is also very slightly more blown out than the 300 Win Mag. Helpful with long 7mm bullets in a 3.6" box(aka all Rem 700 actions;M70's can also be easily altered).
The Jarrett is based on the 300 Win Mag case as well. He purloined the Mashburn idea. He's just behind the times by a few decades....