Re: AP warhead on missiles
Straight forward physics would indicate that EFP/SEFOP/SFF rounds resemble AP rounds in terms of similar effects. An armor piercing round generally is thin, long, and heavy (DU Sabot being the extreme case). Often the round is jacketed. Damage is caused by the release of kinetic energy with the straight forward Energy = Mass x Velocity (Squared???).
An EFP round is designed to overcome the issues with its light weight by having a really insane velocity as compared to a normal AP round. EFP rounds have an effective "muzzle velocity" of 6000 to 8000 meters per second. A quick Google is giving values of around 1500 m/s as the muzzle velocity on an M1A2 120mm smoothbore. In addition since an EFP rounds "muzzle velocity" occurs within meters of the target it doesn't suffer from reduced armor penetration at greater ranges.
Given all of this EFP rounds are similar to HEAT in that their effectiveness does not decrease at range.
They are similar to AP in that damage is caused by kinetic energy and hence is uneffected by ERA.
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