IDPA Power Factors and Ammunition
Lake County IPDA adheres to the Power Factor and ammunition minimum requirements as set forth by IDPA. The following rules apply to ammunition used in IDPA matches.
The First Three Major Rules Are:
- Metal piercing, incendiary, and tracer ammunition is prohibited.
- Clubs may prohibit cartridges that may damage metal targets.
- All ammunition must use a single projectile.
Next We Consider The Ammunition Used.
The goal is to compete with commonly available ammunition.
The IDPA Divisions and Power Factors shown here have been updated to conform with the 2015 and 2017 editions of the IDPA Rulebook (PDF). Several IDPA division definitions and power factors were changed in 2015. PCC data was added here based on the 135,000 power factor published by IDPA in early 2019.
The following tables give the required minimum velocity for various bullet weights in the IDPA equipment divisions and subdivisions listed.
Table Data Notes:
All velocity data was calculated and then rounded up to the next-higher foot per second if an integer result was not obtained.
Calculate the power factor by multiplying the bullet weight in grains by the bullet velocity in feet per second (fps), divide by 1000, and ignore numbers to the right of the decimal.
For example, a 230.1 grain bullet at 794.7 fps: 230.1 x 794.7 /1000 = 182.86047, or 182 power factor.
Official Chronograph Procedures
Chronograph is conducted with the competitor present. Ammunition is pulled and/or bagged prior to arriving at the chronograph stage. The chronograph official will use the competitor-supplied firearm, and the following procedure will be used:
- If two of the three rounds meet or exceed the required power factor, the ammunition is in compliance. Prior to each shot, the muzzle of the firearm will be elevated to vertical (if range rules permit) to move the powder charge to the rear of the case, thus giving the competitor every chance to achieve maximum velocity.
- A bullet will be pulled and weighed using a powder scale. If two rounds exceed the highest velocity for the caliber and power factor, pulling the bullet and weighing is optionally waived.
- A competitor whose ammunition fails to make power factor will be allowed to shoot the match, but their total score will be a disqualification.