I'm using a GT50 and I have no problems with this, so your VT50 should support Full Range. Make sure you select Non-standard range on your TV options for 0-255. There are three options (Standard, Non-standard, and Auto), do NOT select Auto as it will not properly choose Non-standard when you feed it 4:4:4 RGB (Full Range). Also, madVR needs to be set to 0-255.
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