8.6 Blackout 342gr Solid Copper Subsonic Expanding Projectiles (Qty 50)

What this is

This is the 8.6 Blackout 342gr Solid Copper Subsonic Expanding Projectiles (Qty 50).

This is the 342gr solid copper subsonic expanding projectile for 8.6 Blackout, the heaviest weight we stock in this caliber and the one built specifically for quiet, suppressed subsonic use.

Why our heaviest weight is the subsonic one

Subsonic ammunition has to stay under roughly 1125 fps, and at that reduced speed a heavier bullet carries meaningfully more retained energy and momentum than a lighter one moving at the same velocity. That is why 8.6 Blackout’s subsonic role runs to weights like 342gr, far beyond what the supersonic side of the caliber uses.

342gr versus our supersonic 190gr

We also stock a 190gr fracturing projectile built for standard supersonic 8.6 Blackout loads. If you are not building specifically for a suppressor or subsonic use, that lighter, faster option is the one to load instead of this. Compare expected velocity and drop for both on our ballistics calculator.

Frequently asked questions

Is this the supersonic or subsonic 8.6 Blackout weight? 342gr is our heaviest 8.6 Blackout weight, built specifically for subsonic, suppressed use. For a standard supersonic build, use our lighter 190gr fracturing projectile instead.

Why does subsonic 8.6 Blackout need such a heavy bullet? At subsonic velocity a heavier bullet retains far more energy and momentum than a lighter one moving at the same reduced speed, which is why the caliber’s subsonic loads run so much heavier than its supersonic ones.

Will this expand reliably at subsonic velocity? Yes, this is a subsonic-rated expanding design, engineered to mushroom at the lower impact velocity a subsonic load produces rather than assuming a full-power supersonic impact.

Related reading: 8.6 Blackout ammunition, 300 Blackout ammunition, or the ballistics calculator. Reference: SAAMI pressure and dimensional standards.

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