I've fired quite a few rounds through the Cougar 9mm, using both h.ps. and ball of various brands. Never a hitch or malfunction.
Also, if you buy one, you can take a regular 92FS 15 round mag and modify it a bit. if you're handy with a milling machine and calipers, or a set of files, mill a slot in the 92FS mag, EXACTLY the same diminsions and location as the Cougar factory mag magazine release slot, and you have a hi cap mag for your Cougar.
An armorer for a very large LEO dept that issues only Berettas showed me that little trick, and the 92fs mags he modified worked perfectly in the Cougar. FWIW. J.B.