I plead ignorance (which is not hard for me) on all the various Taurus revolvers, but I have a friend with what is a ROSSI Model 88....not a Taurus. It is in SS, but is 38-Special only. The info I read on the Rossi 88 he has was that it was not +P rated and was in 38-special caliber.
Taurus may very well have made a Model 88, but I suppose the question could be academic since Taurus owns Rossi. This little 88 Rossi my friend has is a sweet shooting little gun that basically mimics the Taurus 85 frame-family....or vice-versa. His is a great little gun, but I think would be a handful in 357 mag with the 2-inch barrel.