Starline describes the +P version as follows:
Does anyone have experience with the +P cases? I don't plan to make hot loads, just standard pressure loads. I guess I was wondering if the thicker cases would last longer.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.
Here are links to the two different cases:
https://www.starlinebrass.com/brass-cas ... uto-Brass/
https://www.starlinebrass.com/brass-cas ... o-P-Brass/
Thanks in advance for any insight you might have on this.
Mike