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Anyone do a suppressed subsonic 450 bushmaster or anything like this?

The big issue you will run into is that your drop is so extreme that if you are off by even 50 yards in your range estimation you will likely miss completely. Running it through the ballistic calculator going from 100 yards to 150 yards you have 12.7" drop then almost 2 feet more drop to get to 200 yards. So your range is going to be pretty limited. if you were staying inside of 100 yards you should be hitting with around 550 ft/lbs of energy. Sorry i havent tried it personally just looking at the ballistic info on this one.