Subsonic speed fps for 300 blackout11/21/2023 Unique powders optimized for subsonic use result in a low flash signature, ideal for either suppressed or unsuppressed performance. Because of the heavier bullets and slower speed of subsonic ammo, it is often not stabilized enough to make an accurate shot at long distances. but the speeds were all over the place- bottom end about 1100 FPS and top end around 1500 FPS.
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