The +p+ refers to pressure levels, and not necessarily velocities. However, the factories do load to higher velocities with higher pressures.
But as far as hotter, yes, a fast burning powder could be loaded so hot it would blow up the gun. You could get +P+ pressures with no greater velocities or even less than standard pressure loads.
FWIW, my Kahr P9 is not rated for +P+, and before I learned that I did have some malfunctions with +P+ ammo. The factory rep told me that those pressures caused slide velocities that resulted in malfunctions. I do not get malfunctions with +P. My G26 gets the +P+ ammo I have.
Regards,
Jerry
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Ecclesiastes 12:13 ¶Let us hear the conclusion of the whole matter: Fear God, and keep his commandments: for this is the whole duty of man.
14 For God shall bring every work into judgment, with every secret thing, whether it be good, or whether it be evil.
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