You will need 25 rounds per stage X 8 will equal 200 rounds WITHOUT ANY MISSES!
There are 5 targets per string X 5 strings per stage (25) rounds
As to equipment wait and see what the other competitors are using and ask questions. 2 magazines should get you through each stage
NRA Life Member, NRA Range Safety Officer, NRA Certified Pistol Instructor, IDPA Safety Officer, USPSA NROI Range Officer,
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As you are, I once was, As I am, You will be.