I have a 77/357. Fun little rifle. They do seem to have gone up in price some though. I only paid a little over $500 for it a couple of years ago, and now they are going for over $700 around here. Dont know why the jump though.
Mine seems to prefer 125 grain JHP's and doesnt like 158 grain LSWC's in .38 or .357.
The mag handles 357's without issue, the .38's have a habit of "rim locking" on a fairly regular basis. Once that happens, you have to drop the mag, and fiddle the rounds out.