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I've found the lighter bullets in the 30BR behave differently to the very heavy ones in media. I would also steer away from using FMJs as an example of high end subsonic Whisper performance in the 7.62x39 and suggest that you try (if it is a .311 bore) some 174 - 200 grain HPBTs or RNs.
150 grains is a good supersonic weight for a bullet - it took me a while to tune a load in for the 30BR - but it has the potential to be a solid performer out to 300 plus yards on targets. The 185 was also a great supersonic load for the same reason.
But for subsonic loads, 200 grain Lapua subsonic or 240 SMK are my choice for hunting as they hit hard and bleed out.
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