300 AAC AR Pistol Ammo

[erikpolcrack]

I am considering getting a 300 AAC short-barreled pistol upper for an AR lower. Which kind of ammo will be the better choice - subsonic or supersonic? No suppressor.

 

[ColbyBruce]

Subsonic 300 Blackout ammo for a costly here, $2.00+ per cartridge. If you are not going to suppress it, you will gain nothing by using subs, other than a heavier bullet. Most people I know use 110 grain ammo to hunt with if not using a suppressor.

Hopefully you are aware you can't attach a pistol upper to a rifle lower unless you properly SBR the thing.

Here is my son's Wilson Combat 300 Blackout with a Dead Air Sandman S suppressor.

I bought the PSA AR in 7.62x39 for him as a combination Birthday/Christmas present. With a Keymo adapter attached to the barrel his Sandman S will click and twist right on and my son can shoot those subsonic rounds at half the cost of Blackouts.

 

[erikpolcrack]

Subsonic 300 Blackout ammo for a costly here, $2.00+ per cartridge. If you are not going to suppress it, you will gain nothing by using subs, other than a heavier bullet. Most people I know use 110 grain ammo to hunt with if not using a suppressor.

Hopefully you are aware you can't attach a pistol upper to a rifle lower unless you properly SBR the thing.

Here is my son's Wilson Combat 300 Blackout with a Dead Air Sandman S suppressor.

I bought the PSA AR in 7.62x39 for him as a combination Birthday/Christmas present. With a Keymo adapter attached to the barrel his Sandman S will click and twist right on and my son can shoot those subsonic rounds at half the cost of Blackouts.

Thanks! - Erik

 

[Ivan the Butcher]

I bought 2 boxes of Remington Sub Sonic 300BO bout 2 months ago for $25+/- a box. That was at a gunstore/range thar rents full autos and suppressors! I only use factory to mace sure the action is tuned to the low recoil, then adjust the hand load round to function the action. I made 700 round from 5.56 brass to pass the time during Covid. I suppress my rifle with a 1980's MAC -10 9mm can. Works fine.

Ivan

 

[22hipower]

Same old issue, it depends what you're trying to do. If you're hunting, pigs for example, might as well go with supersonic because they'll hear the shot even if you use sub-sonic and a suppressor. If your intent is hunting, the shorter barrel with a suppressor will be easier to manage but will you get acceptable accuracy at hunting ranges?

At 100 yards and beyond the 200 grain suppressed loads are like throwing baseballs in terms of the trajectory. If you're hunting at night, perhaps using a thermal scope, distance estimation is not easy. I've found using 110-120 grain bullets at max velocity gives the best results and, with a 16 inch barrel anyway, you can hit and make one shot kills at 150 yards. I've toyed with going to a 10 inch pistol barrel for easier carry/use but I don't know that accuracy will be acceptable and would lose some, not a lot, of velocity. Good luck.

Jeff
SWCA #1457

 

[erikpolcrack]

Same old issue, it depends what you're trying to do. If you're hunting, pigs for example, might as well go with supersonic because they'll hear the shot even if you use sub-sonic and a suppressor. If your intent is hunting, the shorter barrel with a suppressor will be easier to manage but will you get acceptable accuracy at hunting ranges?

At 100 yards and beyond the 200 grain suppressed loads are like throwing baseballs in terms of the trajectory. If you're hunting at night, perhaps using a thermal scope, distance estimation is not easy. I've found using 110-120 grain bullets at max velocity gives the best results and, with a 16 inch barrel anyway, you can hit and make one shot kills at 150 yards. I've toyed with going to a 10 inch pistol barrel for easier carry/use but I don't know that accuracy will be acceptable and would lose some, not a lot, of velocity. Good luck.

Jeff
SWCA #1457

Thanks, Jeff! - Erik