I am curious about this. It is recommended that SAA clones such as Ubertis be kept to standard pressure .45 Colt loads which is, I believe, 14,000 psi. Some say that Uberti revolvers can safely handle up to 17,000 psi without problems. My question is regarding the extra .45 acp cylinder that is available for the Uberti and other makes of SAA. A standard 230 grain .45 acp is rated at 21,000 psi. Plus P is rated at 23,000 psi. I would not shoot +P .45 acp from my Uberti, but what is it that allows the safe shooting of a 21,000 psi load in a Uberti or USFA gun that is only recommended for 14,000 psi (or maybe a little more) in .45 Colt?