A few months ago a staff member at my main supplier with much more knowledge of the 1911 than myself suggested that the recoil spring might be too weak, possibly as light as 9 Ib, causing full house loads to work the slide a bit fast.

I recently bought a 15 Ib recoil spring for my Springfield 1911 A1 and put the one I was replacing into the Ranger. It now shoots magazine after magazine of full power .45 apc loads with no problems.