The round was originally formed from cutdown 300 H&H brass. The easier answer now is to use high quality 300 Win brass. Push back the shoulder and reduce the neck, fire form with Cream of Wheat.
It has about 8 grains more case capacity than a 7 mm Rem with a longer neck and 30 deg shoulder.
There are a number of articles on the Fire from 2011-12 about performance. It is easy to get 3050 with a 175 using H1000 (72-73 gr. in my gun) 3200 with a 160 is safely obtainable. Al of this in a 7.5-8 lb package and very good accuracy if your smith does a good job. One thing that my smith has done is cut a 1.5 deg throat.
With the long neck you can load with the base of the bullet at the neck base and use all of the case capacity.
It is NOT a 7mm Practical.
The round is not a full length H&H like the STW nor a shortened round like the 7mm Rem. It is just right.
Bob Hagel also wrote an article for Rifle magazine which is available in the old Big book of articles that they published.
