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I've used them and don't see any advantage to them for subsonic. They don't deform of course, and they are kinda 'spensive.
On the other end of expensive bullets, I've used several hundred cast bullets in .300Wh. Oregon Trail's True Shots are 200 grain gas-checked bullets; I've had good accuracy and reliability with them. A little bit of leading on the bolt tail where the gas spits onto it, nothing remarkable though.
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