Shoot without the supressor. Ladder Test. .3gn increments from book starting loads til you hit pressure signs
40mm at 235 is pretty much 1MOA, so on a factory rifle that's quite aceptable.
24" should get you a bit more velocity though.
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Just to be sure, Torque your stock/action screws, make sure barrel is fully floated, get trigger pull as low as you are comfortable with.
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