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Does anybody what the difference in the case's will be? Will they be interchangable? Same performance? Thanks for any help.

Mike
 

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17 Mach IV is on the left - 17 Fireball is on the right.
In certain chambers they will be interchangeable, depending upon exact neck dia and length. There might be a degree or two difference in shoulder angle, and .010 or so difference in neck length.
 
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