Whenever I've spoken with reps, sales folks & armorer instructors from some of the big gun companies, and the subject of .45 ammo comes up, it's been quite common to hear that their customer input (both LE & non-LE) indicates that standard pressure 230gr loads are the most popular selling loads, overall, with lighter bullet weights and +P running significantly behind, sales-wise. Sure, that sort of thing will probably play out differently from one locality or one store to another, but overall, it's the standard pressure 230's that seem to sell better for them, in the overall big picture. Ditto talking to repair techs and engineers upon occasion, and hearing how they do the bulk of their R&D for .45 pistols with 230gr ... because that's the most commonly used bullet weight according to their customer & marketing surveys. One interesting exception was when I was speaking to a manager for Ruger, and he said the reason they originally bumped up the weight of their P90 recoil spring was due to learning that a number of their customers were apparently trying to "Magnumize" (his words) their P90's by using a brand of 200gr +P, which was also a bit harder recoiling than the 230gr loads. They were originally using the same recoil spring in the 9mm P89 & .45 P90, but later added a pound (I think he said) to the P90 spring to better mitigate the slide velocity of the P90 if +P was being used. They also introduced the dimpled feed lips to help prevent displacement of the top round due to increased recoil. I learned when speaking to S&W that they under stood their LE customers might sometimes use .45 +P, and if we desired, we could ask their engineering dept if they'd tested a specific brand of +P in the model we were using, to see if they had any suggestions or comments. Naturally, though, it's prudent to make sure the company making any particular .45 even recommends the use of +P ammo in their gun. Some folks find the recoil of the +P to affect their handling & controllability, regardless of whether it's being used in full-size or smaller guns, or whether they're made with steel, aluminum or plastic frames. Just depends, I suppose.