Well I'll have to be on the lookout for the Winchester FBI load if I could ever find some. I like the Buffalo Bore products, but I'm thinking I might stay away from this at the time being due to some tests I've seen.
In the meantime, I recently learned that the NYPD issues the Speer Gold Dot 135 grain .38 special +P short barrel load not only for there snub nose guns... but also for the few officers left who still carry there 4" Model 10 revolvers on duty as there service handgun. They do not use a special load for the longer barrel guns, and supposedly the longer barrel gets about 50% more energy and the velocity is about the same as the Speer Gold Dot Short Barrel 135 grian .357 magnum load... which also uses the same bullet as the .38 special +P load... so basically using the .38 special +P short barrel Speer load in a 4" gun (like my Model 64 police trade in) would be like using the .357 magnum short barrel load in a 1 7/8"-2" snub nose revolver. I have a couple boxes 20 round boxes of the .38 +P short barrel load that I use for CCW in my S&W Model 642-1, and last night I ordered two 50 round boxes of the same load so I can test them and see how they run in my Model 64.
I think I will use that at least till I can find some of the aforementioned FBI load out there. Just haven't had any luck so far!