It should be fine in your pistol.
You may need to tweak your load a tad as the brass is slightly thicker in the +p cases giving you slightly higher pressures. Pulled this from Starline's website.
"The 45 Auto+P is a strengthened version of the 45 Auto with the same external dimensions. A thicker web and heavier sidewall at base strengthens the case in potentially unsupported areas. This case has approximately 2 grains less internal water capacity than the standard 45 Auto."
Starline is good brass you will not be disappointed.
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