Depending on Brass and Chamber, id say 45 is too hot for a 175gr.
in my 308s its generally been with Saami chamber
150-155 gr 47gr 2208
165-168gr 44-44.5gr 2208
Obermeyer chamber
155gr 45.8gr 2208
Usually Lapua or Sako brass
But have a look at your primer pockets, measure them with your calipers and compare to SAAMI that will tell you if they are out of spec or not
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