One of the differences between the two cartridges is going to be ease in loading. The Hornet neck is very thin and with tiny 17 caliber bullets it is difficult to set them in the neck straight before seating the bullets - unless you have a straight line seater. Even then you are going to buckle some necks on the 17 hornet. You won't have this problem on the FireBall to as great an extent.
The other problem will be rim thickness for primary headspacing. Domestic Hornet brass does not hold to tight tolerences in Hornet brass. The FireBall being rimless will fire form to the chamber and with properly set up dies not have this problem. Of course the Hornet will, or should headspace on the shoulder after fireforming too, but remember the brass is thin. It is my opinion that the FireBall will prove to be easier to live with. Let the flaming begin!
Bob
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