Show off your 300 AAC rifles!

If anyone is looking for 300 BLK brass, Rookie{OMC} has a setup for converting 223 cases that works great. He did an ammo can worth for me and they turned out excellent.

Price?
Mixed headstamps?
Is he forming them or just cutting the shoulder off so they are ready to go through the press?

I have 700 brass formed and primed but more is always better :)
 
Price?
Mixed headstamps?
Is he forming them or just cutting the shoulder off so they are ready to go through the press?

I have 700 brass formed and primed but more is always better :)

You have to supply your own brass but he does the complete forming process including deburring. Cases are ready to prime and load when you get them back.

For the price you will have to contact him direct. He posted above in this thread.
 
Managed to get 2lb of A1680.

220gn SMK, 11gn A1680
2.190 AOL
16" core 15 upper
5 rounds cycle but no lock back.
1" group at 50 yards.
 
Lucky you guys still get to play with the 300blk. I went to install a rail on mine and found the barrel nut has been so over torqued that i cracked the upper trying to loosen it. My Upper is now on its was to Core15 for repair........ Efffffff
 
Why is everyone so impressed with 2-4MOA groups at 50 yards?

Am I missing something here?

I don't think so.

Welcome to the .300BLK club; where spending hundreds or thousands of dollars to upgrade your rig so that you can shoot bullets that are .07" wider, 2x costlier and 10x more finicky then .223 is the "COOL" thing to do!
 
Where did all the hate come from. You dont like 300blackout rifles or the groups that people are getting while building handloads. Stay the hell out of the thread
 
Why is everyone so impressed with 2-4MOA groups at 50 yards?

Am I missing something here?


My 9.75" 300BLK is getting about 1.5moa and the groups are getting smaller the more I experiment. Who's impressed with 2-4moa @ 50?
If you don't like them don't buy one.
Go stir the pot somewhere else.
 
Why is everyone so impressed with 2-4MOA groups at 50 yards?

Am I missing something here?

The 2-4 moa isnt the issue at moment for me, I can get 1 moa with 110vmax all day.

I am testing 220gn subsonics for fun, and managed to get them to cycle after trying a few powders.
 
10.8gr of AA1680 with 220gr SMK - cycles and locks the bolt open.

LMT 16" MRP barrel...

I also found old 20 round Colt mags work the best with the heavy subsonics...
 
I wil try some diff mags to see if it locks open the bolt.

In my rifle with 9.75" barrel the minimum charge that will lock the bolt back is 12gr of AA1680 pushing the Hornady 208gr match. maybe try a ladder increasing powder till you get it to cycle and lock then start there with your ladder for accuracy. Every gun will be slightly different so it's very possible you just haven't found your minimum charge yet. I doubt it's a mag issue.
 
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In my rifle with 9.75" barrel the minimum charge that will lock the bolt back is 12gr og AA1680 pushing the Hornady 208gr match. maybe try a ladder increasing powder till you get it to cycle and lock then start there with your ladder for accuracy. Every gun will be slightly different so it's very possible you just haven't found your minimum charge yet. I doubt it's a mag issue.

I tried 11.5gn and still no lock back, i wanted to keep it subsonic.

I also tried some 150gn and 168gn with A1680, both (super) locked back on last round.
 
Lucky you guys still get to play with the 300blk. I went to install a rail on mine and found the barrel nut has been so over torqued that i cracked the upper trying to loosen it. My Upper is now on its was to Core15 for repair........ Efffffff

And THAT is why it is important to use the correct work holding when working on these rifles. An aluminum receiver is all too easy to bend or break inadvertently.
 
Why is everyone so impressed with 2-4MOA groups at 50 yards?

Am I missing something here?

The BLK is important and popular for two reasons, neither of which has anything to do with accuracy.

1. It is virtually unaffected by barrel length meaning that it produces much greater terminal energy and stopping power out of a short barreled carbine than the 556 is capable of.

2. It is capable of cycling subsonics in an AR action which means it can be more effectively suppressed to give a very quiet yet powerful close range weapon.

The BLK's performance envelope is really optimized within 200-300 yds. Within that range, 1-2 MOA is slightly irrelevant when engaging tactical or game targets.
 
I tried 11.5gn and still no lock back, i wanted to keep it subsonic.

I also tried some 150gn and 168gn with A1680, both (super) locked back on last round.

Did you chrony them? How do you know they won't still be subsonic? Keep going till you get it to cycle and lock back and take your chrony with you. Are you going to sacrifice reliable loads just to keep it subsonic?
I don't know how a different mag is going to stop it from short stroking, needs more powder.
I use LiL'Gun for my 150-170gr bullets.
I'll take my chrony with me next time I go testing and will report back what velocity I'm getting with mine.
 
Did you chrony them? How do you know they won't still be subsonic? Keep going till you get it to cycle and lock back and take your chrony with you. Are you going to sacrifice reliable loads just to keep it subsonic?
I don't know how a different mag is going to stop it from short stroking, needs more powder.
I use LiL'Gun for my 150-170gr bullets.
I'll take my chrony with me next time I go testing and will report back what velocity I'm getting with mine.

I hope to do some more testing tomorrow or saturday with the chrony. The 220 are just for fun, i plan on shooting 150gn but will get back to you with results.
 
And THAT is why it is important to use the correct work holding when working on these rifles. An aluminum receiver is all too easy to bend or break inadvertently.

Oh i was using proper methods. Im a pipefitter by trade and know about torquing threaded connections all too well. The threads on an upper are what 7/8-1" in diameter. 30-80ft/lbs is barely anything on a thread that large. Hence why its now being sent to Core15 for warranty because of their mistake of either over torquing the nut or using thread sealant.
 
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