I am tired of this round being misrepresented on forums. It is rated @ 1240fps from a 4" barrel (bbl is not on the website but it is on the spec sheet).

Regarding pressure, I asked Winchester Law Enforcement:

I noticed that RA9TA lists an operating pressure of approximately 40,000
CUP. Since in that range it is not immediately convertible, do you have
an approximate PSI rating?"

Winchester (name removed) replied:
"I have attached an updated spec sheet on this product. It shows 42,000
CUP. Roughly translated into PSI it would be 40,000 P.S.I. A regular
9mm has a MAP (Maximum Average Pressure) of 35,000 psi and a +P 9mm
would be 38,500 psi.

Sincerely,
(name removed)
Winchester Ammunition

Here is the spec sheet: RA9TA