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Old June 12, 2018, 07:52 AM   #9
Bartholomew Roberts
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Join Date: June 12, 2000
Location: Texas and Oklahoma area
Posts: 8,462
Federal 168gr Fusion in .300 BLK is still supersonic out of a 9” barrel, although not by much at about 1,450fps. Most subsonics are in the 180gr+ range. Also relevant is that 220gr is about the heaviest subsonic you can feed through an AR, so for semi-auto use that is your top end.

The 9x39 that Wolf is importing is 278gr and works just fine in semi-autos. If you are limiting yourself strictly to suppressed, subsonic, use then it looks very interesting.

My complaint with both subsonic .300 and 9x39 is inside of 200m, they offer about 100 ft/lbs more energy than say a subsonic 147gr 9mm JHP; but the in-flight ballistics are similar over that distance. However, ammo cost is substantially higher for the .300 and 9x39 (especially if you want expanding ammo). Past 200, that sleeker profile starts to pay off but by then you are already outside the practical range/wind estimation and shooting capabilities of most recreational shooters.

For most people who just want a quiet semi auto, a suppressed pistol caliber carbine in 9mm or .45 makes the most sense.
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