I initially came on and posted that the Corbon 90 .380 was labeled +P, and as such Ruger says no in the LCP.
I went online to look it up, and the Corbon round is no longer labeled +P, though the performance, at least as printed on the box (1050 fps) is the same.
Funny, because I have several boxes of it clearly labeled +P. They have changed the designation, and kept the performance the same.
So, I deleted my post.
NOW, that being said, I have shot the 90 grain .380 Corbon load out of my Kahr P380, and got a 5-shot average of 945 fps - for 179 ft/lbs ME. I would expect the velocities out of the LCP to be about the same. I promise you will not get 1050 fps from that load in the LCP.
I never shot the Corbon in my LCP, because the lot I have was labeled +P.
Guess I'll give it a shot, pun intended, in my LCP now.
FYI, I get 877 fps for 155 ft/lbs ME from Speer Gold Dot 90 grain JHPs out of the LCP, and I like the construction of the bonded Gold Dot bullet. I believe it will penetrate better than the bullet Corbon uses in their 90 grain .380 load.
Anyway, I'll report back with velocities of the Corbon 90 grain load out of my LCP when I try it.