Prvi Partizan makes 173 gn SP in both 7x57 and 7x57R. Component bullets too. IIRC Woodleigh also makes a 175 gn PPSP.

For my part, while I've given the heavies a run in a 7x57 and a couple of 7x57R, I'm happy to use something around 139 - 150 gn for the use to which I put them. Something like Prvi Partizan 139 gn, or Speer's 145, or a Winchester 150 gn Power Point. All of these seem to do a good job on pigs and deer and such, and shoot a mite flatter than the heavy ones.