Hodgdon doesn't list that exact combination but it's quite easy to extrapolate from their data that 50.0gr is WELL over the expected starting load.
They show 175gr HPBT at 46.0-49.0gr and 155gr HPBT at 48.0-51.0gr.
A 165gr SP is listed as max of 52.0gr.
The 175gr is so close that I'd just use that. No way I'd start at 50.0.
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