In my 47th lyman manual the 357 mag loads mirror the loads listed for the Contender.
They show a 110gr Winchester JHP loaded with 13.0grs of AAno5 at 42,000 CUP at just a little over 2000FPS in a 10 inch barrel!
You have what you have! If you want a good 200 yard varmint gun get you a 22-250 or the like. No getting around it. Sorry!
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