220 grain bullets and 4227

[JFCisme]

My AR is a DoubleStar Hunter AR-15 A3 Upper Receiver Assembly 300 AAC Blackout 16" Barrel 5/8"-24 Threaded Muzzle with Thread Protector on a DPMS lower. A Silencerco Omega was on throughout.



The Bolt action is a Ruger American Ranch Rifle with the screw on adapter for the Omega. Scope is a Primary Arms 1-6x.



When I loaded these at 9.0 grains of 4227 the bolt would not lock back on the last shot in my AR.

I put all these bullets through my .309 Lee Sizer Die. This doesn’t require Alox as the Hi-Tek coating lubes them.

Steel Valley Casting = SVC


Name: SVC . 309. bolt action rifle
Notes: OAL 2.185, 9.2 grains of 4227
Shots: 10
Average: 1054 FPS
SD: 23 FPS
Min: 1012 FPS
Max: 1089 FPS
Spread: 77 FPS
Power Factor Average: 232
Power Factor Low: 223
Power Factor High: 240
Barometric Pressure: 30.2 inHg
Temperature: 81F
Weight: 220 grains


Name: SVC .309 A.R.15
Notes: 2.185 OAL 9.2 grains 4227
Shots: 10
Average: 1037 FPS
SD: 13 FPS
Min: 1017 FPS
Max: 1056 FPS
Spread: 39 FPS
Power Factor Average: 228
Power Factor Low: 224
Power Factor High: 232
Barometric Pressure: 30.2 inHg
Temperature: 81F
Weight: 220 grains

Leather Head = LH

Name: leather head. 309 bolt action
Notes: 2.185 OAL 9.2 grains of 4227
Shots: 10
Average: 1044 FPS
SD: 19 FPS
Min: 1016 FPS
Max: 1075 FPS
Spread: 59 FPS
Power Factor Average: 230
Power Factor Low: 224
Power Factor High: 237
Barometric Pressure: 30.2 inHg
Temperature: 81F
Weight: 220 grains

Name: leather head. 309 A.R.15
Notes: OAL 2.185 inches and 9.2 grains of 4227
Shots: 11
Average: 1046 FPS
SD: 19 FPS
Min: 1020 FPS
Max: 1072 FPS
Spread: 52 FPS
Power Factor Average: 230
Power Factor Low: 224
Power Factor High: 236
Barometric Pressure: 30.2 inHg
Temperature: 81F
Weight: 220 grains


Note Berry’s Bullets are loaded with 9.4 grains of 4227 in this example. When I loaded all of them with 9.0 grains of 4227 the Berry’s bullets had a POI two inches lower than the Hi-Tek bullets. With this load the POI is the same as the Hi-Tek bullets at 9.2 grains of 4227. The copper coat really slows these down.

Name: Berry’s bullets .309 bolt action
Notes: 9.4 grains of 4227 2.080 OAL
Shots: 10
Average: 972 FPS
SD: 29 FPS
Min: 930 FPS
Max: 1023 FPS
Spread: 93 FPS
Power Factor Average: 214
Power Factor Low: 205
Power Factor High: 225
Barometric Pressure: 30.2 inHg
Temperature: 83F
Weight: 220 grains

Name: Berry’s bullets .309 A.R.15
Notes: OAL 2.080 with 9.4 g of 4227
Shots: 17
Average: 1011 FPS
SD: 23 FPS
Min: 944 FPS
Max: 1042 FPS
Spread: 98 FPS
Power Factor Average: 222
Power Factor Low: 208
Power Factor High: 229
Barometric Pressure: 30.2 inHg
Temperature: 83F
Weight: 220 grains

[wscrst]

Thank you for sharing your data. I am a novice an about to embark on handloading with a setup that is very similar to yours. I had trouble with factory ammo and suppression. At 9.2 grains, were you satisfied with the suppression you were getting? Again, thank you very much for your generosity.

[JFCisme]

At 9.2 grains, were you satisfied with the suppression you were getting? Again, thank you very much for your generosity.

Noise is pretty subjective. I think my Omega is pretty awesome. My goal was to make one load that is suitable for both rifles. My AR has to cycle reliably and lock the bolt back on an empty magazine. I also want to do gun games and need my AR to wallop steel under 100 yards.

Since you stated you're a novice reloader, you should have the tools to be successful. Use a chamber gauge to check your brass before and after loading. Also, have a good dial micrometer. I don't make my rounds 2.26", because of ogive and 220 grain bullets.

Have fun