I recently purchased a Rossi 68 .38 with a 3" barrel. I bought it to carry while working on my farm as rattlesnakes are prevelant. In the two weeks I've owned it, I've fired right around 300 cast bullet handloads in it. For its size, is quite an accurate little pistol. None of my loads are of the +P category as I shot ALOT and am not interested in wearing my pistol out. Two of my bullets, one a 165 gr. SWC the other a 168 gr. SWC are capable of 750-800 fps according to my chronograph, and shoot quite well. I just can't imagine how a +P load would help much.
I'm having real problems with bullet impact being somewhat high (see post0, but have ordered larger grips. Don't know if this will help, but there it is.