First try at loading the Blackout

[ajb]

I just came in from firing my first reloads through my 16" AAC upper. I only loaded 10 to check for functioning. The first 5 cycled fine but didn't lock the bolt back when empty. Second 5 cycled fine and did lock back empty. I didn't chrono them or really check accuracy, strictly function.

I used cases I converted and:

220 grain SMK
WSR primer
10.8 gr. A1680
OAL 2.1"

I might try bumping the powder charge up. Any suggestions or critiques?

I've been reloading for 30 years, first time with anything like this.

[talonxracer]

New upper?

[JoeHarley13]

Your charge is pretty light, 11.3gr gave me 963 fps. I didn't go supersonic until over 12.4 gr. Bump your charge up a few more tenths. 11.3 did lock mine back.

Note, mine were out of a 8.5" barrel vs. Your 16".

[tallburnedmidget]

I just came in from firing my first reloads through my 16" AAC upper. I only loaded 10 to check for functioning. The first 5 cycled fine but didn't lock the bolt back when empty. Second 5 cycled fine and did lock back empty. I didn't chrono them or really check accuracy, strictly function.

I used cases I converted and:

220 grain SMK
WSR primer
10.8 gr. A1680
OAL 2.1"

I might try bumping the powder charge up. Any suggestions or critiques?

I've been reloading for 30 years, first time with anything like this.

I shoot a 16" AAC upper and 10.8 at COAL 2.120" what functioned well for me. You are loading a little shorter than I am but if you the load shoots accurate enough for your liking, you may be set. Chrony'ing them is the best way to go but I believe you are dancing all around your desired load for sure.

Good luck

[ajb]

New upper?

New to me. I was told it had about 200 rounds through it when I bought it.

[ajb]

I just came in from firing my first reloads through my 16" AAC upper. I only loaded 10 to check for functioning. The first 5 cycled fine but didn't lock the bolt back when empty. Second 5 cycled fine and did lock back empty. I didn't chrono them or really check accuracy, strictly function.

I used cases I converted and:

220 grain SMK
WSR primer
10.8 gr. A1680
OAL 2.1"

I might try bumping the powder charge up. Any suggestions or critiques?

I've been reloading for 30 years, first time with anything like this.

I shoot a 16" AAC upper and 10.8 at COAL 2.120" what functioned well for me. You are loading a little shorter than I am but if you the load shoots accurate enough for your liking, you may be set. Chrony'ing them is the best way to go but I believe you are dancing all around your desired load for sure.

Good luck

I think I'll load a few more like that to chronograph and a few at 11.0 grains to check also. At least I don't have to drive to a range, just walk out the back door.

[Sharkbite]

I just came in from firing my first reloads through my 16" AAC upper. I only loaded 10 to check for functioning. The first 5 cycled fine but didn't lock the bolt back when empty. Second 5 cycled fine and did lock back empty. I didn't chrono them or really check accuracy, strictly function.

I used cases I converted and:

220 grain SMK
WSR primer
10.8 gr. A1680
OAL 2.1"

I might try bumping the powder charge up. Any suggestions or critiques?

I've been reloading for 30 years, first time with anything like this.

I shoot a 16" AAC upper and 10.8 at COAL 2.120" what functioned well for me. You are loading a little shorter than I am but if you the load shoots accurate enough for your liking, you may be set. Chrony'ing them is the best way to go but I believe you are dancing all around your desired load for sure.

Good luck

I think I'll load a few more like that to chronograph and a few at 11.0 grains to check also. At least I don't have to drive to a range, just walk out the back door.

Walk out the backdoor? What you live in South Central LA??

[randyrucker]

11.0 gr A1680 should be close to what you want. Why are you loading them so short ?

[ajb]

I shoot a 16" AAC upper and 10.8 at COAL 2.120" what functioned well for me. You are loading a little shorter than I am but if you the load shoots accurate enough for your liking, you may be set. Chrony'ing them is the best way to go but I believe you are dancing all around your desired load for sure.

Good luck

I think I'll load a few more like that to chronograph and a few at 11.0 grains to check also. At least I don't have to drive to a range, just walk out the back door.[/quote]


Walk out the backdoor? What you live in South Central LA?? [/quote]

If that were the case I'd just shoot out THROUGH the back door.
I have a 100 yard range in the back yard and 120 acres of farm land to play on.

[ajb]

11.0 gr A1680 should be close to what you want. Why are you loading them so short ?

If you mean OAL, the manual I printed from the AAC website says 2.089" is optimal for feeding. I thought I was going a little long, and light on the powder.

from the website:


R-P 300 AAC BLACKOUT brass
• Remington 7.5 primers
• 11.2 grains of A1680 powder
• Sierra 220 MK loaded to 2.089 OAL (this length is optimal for reliable feeding
from USGI magazines)
• Chamber pressure 21,100 psi.