Yes, I’m going to talk about silencers or suppressor again. The last time I did so a cacophony of whining and excuse-making began. So, before we can begin our examination of the silenced firearm we need to agree on one basic premise. That premise being the fact that the noise generated by a gunshot is a mere byproduct and does not add to the terminal performance of the bullet. If you are with me on this point lets drive on. If not, I’ll catch you next month.
The biggest trend in AR’s or black rifles today is to chamber a standard AR sized rifle for a .30 caliber cartridge. Numerous ammunition manufacturers have offered their versions to include the .300 Whisper, .30 Remington AR, 7.62x40 Wilson Tactical, and of course, the .300 AAC Blackout.
It’s no big secret that the AAC Blackout cartridge is based on J.D. Jones’ original .300 Whisper round. The Whisper was developed at a time when the ownership of AR rifles and silencers was a mere fraction of what it is today. Our modern playing field has obviously changed quite a bit in the last thirty years.
Ammunition for the .300 AAC Blackout as well as the .300 Whisper are currently available in both supersonic and sub-sonic configurations. When fired from a semi-automatic, gas-operated system there will always be some residual noise from the gas escaping the action. Also, you cannot get around the supersonic crack made by the projectile breaking the sound barrier.
For this review I’m going to focus deliberately on the sub-sonic offerings in .300. The firing system from which I will launch this ammunition will be the new AAC Micro 7 rifle chambered for .300 Blackout. Yes, we all know that Advanced Armament Corporation makes silencers not firearms. AAC is owned by the same parent company who owns Remington Arms. Viola! You have a bolt action rifle chambered for the .300 AAC Blackout.
Micro 7 Rifle Specifics
Yes, the Micro 7 is built on the Remington 700 short-action. The owner’s manual included with the rifle is actually the Rem. 700 manual. The AAC Micro 7 rifle is small and light-weight, hence the Micro moniker. The barrel is 16 inches long with a 1 in 8 twist for the slower, heavy bullets. As it is assumed the end user will be employing a silencer, the muzzle is threaded for the normal .30 caliber 5/8-24 TPI. AAC includes a thread protector.
An “X-Mark Pro” adjustable trigger with a two position safety is included as part of the package. The bolt action is fed from a four round magazine with a hinged floorplate. Atop the action AAC has include a 20 MOA Picatinny scope rail. A black nitride finish is applied to the metal parts.
The barrel and action are bedded into a black synthetic stock. This stock has an adjustable cheek piece and a rubber buttpad. Standard sling studs are located fore and aft. Empty weight is right around 6.5 pounds.
Ironic as it may sound; I used a SureFire Model 762 suppressor with adapter for this review as I was still waiting for my Tax Stamp paperwork to clear for the AAC .30 caliber silencer. Fear not, when my latest batch of Tax Stamps clear I’ll report on the AAC cans.
Range Time and Testing
When considering the sub-sonic ammunition for the .300 Blackout/Whisper, we must understand that the trajectory is going to be more like a rainbow than a laser. The Remington 220 grain Open-Tipped Match bullet is factory loaded to travel at 1010 FPS from a 16 inch barrel.
The good news is that the ballistic coefficient for this projectile is excellent, 0.573 according to my calculator. That’s better than the 175 grain .308 Winchester loads. Bullet stability is not the question. For the energy guys out there, the FPE for this projectile at 50 yards is 483. While that statistic might not seem too spectacular, when compared to traditional sub-sonic, suppressed cop guns in 9mm or .45 ACP is a bit more impressive.