Built my 300 Blackout, it's a TBRC Upper, 8" CMMG Barrel, Spikes Lower w/ LWRC Parts Kit, Pistol Length Gas, Spikes T2 Buffer. Upgraded Extractor Spring w/ BCM Spring/O-ring.
All loads below achieved BCO on last round, using Lancer 20rnd mag. All went bang.
2.165 (those marked crimp have very slight crimp, using Lee Factory Crimp Die
Using 220Gr Pro Hunter Round Nose from Sierra & Brass I picked up in Classifieds from Gabes Brass (which is awesome)
Chrono Results:
I'm thinking @ this point:
9.5 should be tested w/ more rounds obviously, but for accuracy (and that still needs testing), it may be best.
Should try some higher loads, maybe 9.6 & 9.8.
PS: Couple beside me (she was smokin hot) didn't notice I had electronic muffs on (public range, they were all shooting handguns), and kept talking about how quiet my AR was, must say, loved overhearing them!
Advise / Comments / Feedback? (Yeah, thread is worthless without pics, will try and get some up, sorry, have none of the hotty)
Subsonic Results in 8" CMMG Barrel, SR4227: Thoughts
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