300 AAC Blackout Chrono Data

[Mayday671]

Fired the first 10 rounds of 300 AAC Blackout ammo through my rifle today. This ammo is scary quiet without a suppressor, now i'm really excited to receive my suppressor and test with a decibel meter.

Rifle: Bushmaster XM15-E2S (registered short barreled rifle)
Barrel length: 10.5"
Ammo: Remington 220 grain OTM 300 AAC Blackout (Subsonic)
Altitude: 800ft
Humidity: 85%
Wind: 5mph from the 3 O'clock
Temperature: 82 degrees


Round 1: 1064fps
Round 2: 1079fps
Round 3: 1046fps
Round 4: 1089fps
Round 5: 1049fps
Round 6: 1085fps
Round 7: 1056fps
Round 8: 1054fps
Round 9: 1048fps
Round 10: 1026fps

Low Velocity: 1026fps
High Velocity: 1089fps
Average Velocity: 1059
Extreme Spread: 63.84fps
Standard Deviation: 19.74

 

[Cwood]

We did some testing at the Hush shoot with a PWS 9" upper and a Gemtech Sandstorm using both the Remington 220gr and Hornady's 208gr ammo. It was quiet 119db at the ear, 125bd at the muzzle.

 

[Aszerigan]

Spread is WAY too much. 63FPS over 10 rounds? Especially at low vel.

 

[Mayday671]

Spread is WAY too much. 63FPS over 10 rounds? Especially at low vel.

That is why i dislike factory ammo. I should have 208 A-Max and 110 V-Max data soon.