Would you be so kind as to show us some examples of where the velocity of a +P load matches or exceeds (even by the slightest fraction) the velocity of a +P+ load while using the same cartridge, same bullet weight and same manufacturer.
I did not stipulate the same manufacturer, nor did I mention claimed velocities. I referred to delivered velocities of the same bullet weight in the same weapon on the same chrono, same time.
However:
Federal 9BPLE (+P+) clocked slightly over 1200 fps at the same time Cor-Bon +P of the same weight clocked slightly over 1300 fps. IIRC, the Federal round about duplicated the velocities of Remington +P of the same weight. Other lots of the various ammunitions cited may produce slightly different results, as may different weapons.
Relative performance of the bullets was interesting. The Federal round simply shredded itself, the Cor-Bon's nose partially fragmented during expansion and produced secondary wound channels (don't recall the expanded diameter) and the Remington round mushroomed nicely to around .54. While the Federal round may have an enviable rep on the street, the lack of projectile integrity was disturbing and possibly has something to do with it's relatively poor rep on very large individuals.
Bear in mind, manufacturers generally do not design a different bullet for the +P and (where available) +P+ ammo. You're simply driving the same bullet faster. This may produce better expansion, it may also drive the round past it's design limitations and result in a failure to maintain integrity. With todays improved bullet designs, higher velocities are not necessary for adequate expansion.
Terminal performance is dictated by bullet placement, not velocity.
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