Highest Rifle Velocity
5278 fps in .22-243 Middl.
5130 fps in .22-250 Ack Im
Most Powerfull Rifle
14412 ft-lbs in .700 NE
13109 ft-lbs in .50 BMG

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Energy, IPSC PF and OGW

Energy
Energy, or more correctly, the Kinetic Energy, is calculated from the bullets weight and velocity.

IPSC PF
This IPSC Power Factor is an index that tells us if the momentum is bellow or above the Minor/Major class limit.
The Minor class is for rounds with a PF larger then 125 and below 165 (or is less than .40 caliber in "Limited").
The Major class is for rounds with a PF larger then 165.

OGW
(This is a formula specially designed for rifle loads. With lighter pistol calibres and loads, this formula is rather useless.)

The OGW is an abbreviation for Optimal Game Weight formula. Compared to the TKO formula, this will give more credit to faster bullets, but will also favor heavier bullets. The OGW result indicates the maximum animal weight this caliber and load would effectively kill.

Keep in mind that these formulas is a rather simple way of giving different loads and calibers a comparing index, not an exact value for how effective it is against a specific animal. Shot placement, bullet quality and distance (remaining speed of the bullet) are also essential criteria that will affect the “killing power” of a bullet.
Over the past years there have been many words spoken and columns written on these formulas. Continue the discussion on the ReloadesNest Forum.