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This should give you an idea of what to expect with subsonics in a case similar to the 30BR:
Sierra 220gr/ 2400 10.2gr/ Win primer
Sierra 220gr/ 5744 11gr/ Win primer
Sierra 220gr/ 4759 11gr/ Win primer
Sierra 220gr/ Trail Boss 8.0gr/ CCI 200 primer
With a 150gr hunting bullet, you should be able to get 2600fps or better with H4198 powder.
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