300BlkTalk

All things 300 AAC BLACKOUT
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PostPosted: Sat Dec 31, 2011 11:08 am 
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Great! Thanks.


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PostPosted: Sat Dec 31, 2011 8:18 pm 
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Hi all,

I've been working on my 300 BLK loads for a while now, and thought I would share what I have done so far. I still have a lot to do.

I have a CMMG 16" barrel in a AR-15, no can, yet. So, I've been focused on super-sonic.


Bullet............wt......Powder...wt......fps......OAL

Hornady V-Max....110gr....H-110....19.5....2340....2.068

Nosler BT........125gr....H-110....18.0....2171....2.085
Speer TNT HP.....125gr....H-110....18.5....2180....2.040
Speer TNT HP.....125gr....300MP....18.5....2126....2.040

Hornady FMJBT....150gr....H-110....16.0....1931....2.065
PPU M80 FMJBT....145gr....H-110....16.0....1921....2.080
Hornady FMJBT....150gr....H-110....16.5....1945....2.065
PPU M80 FMJBT....145gr....H-110....16.5....1974....2.075
PPU M80 FMJBT....145gr....300MP....16.5....1901....2.075
PPU M80 FMJBT....145gr....300MP....17.1....1978....2.075
PPU M80 FMJBT....145gr....300MP....17.6....2020....2.075

These are results from several days at the range with my chrono. I mention this because I did notice a little difference in average fps of the same load from different days. Probably due to temp and humidity differences, etc. All the above are averages from 5 shots.

I started with Hodgdon H-110 before they published their official data. My 110gr and 125gr were pretty close to what they published, which made me feel pretty good that I am on the right track with the rest of my loads. In most cases, I worked up to these loads from a couple grains less.

I've just started testing the Alliant Power Pro 300-MP after seeing some others post that it might be a good super-sonic powder in the 150+ weights. It would be nice if Alliant would publish some official data on 300 BLK some day. For now, I started with the same loads as I was using for H-110 and go up from there. So far, so good. I was able to push that 145gr over 2000 fps, and no signs of over pressure. I plan on running a few at 18gr just to see what the case and primer look like. But I'm pretty happy with it at 17.6gr. I'm not done testing with 300MP.

On my next range run, I'm going to run some Hornady 150gr with 300MP. I expect very similar results as the PPU 145gr, as they look the same except the 5gr diff.

I got the PPU M80 bullets pretty cheap, about 0.13 each in bulk. But, you get what you pay for. The ogive seems to be a little inconsistent with the length of the bullet. Meaning inconsistent seating depth by 0.010 or so. Not a big deal, I only meant to use them as plinker loads anyway. Just thought I'd mention it. All other bullets I used so far have seated very consistently. I'm using Lee dies in a Dillon 550B.

So far, the 110gr V-Max has been the most accurate. The TNT seems pretty good as well. I need more testing with the others before commenting on them.

After a lot of looking around, I decided my end goal in super-sonic is to safely get each of these bullet weights at these velocities or faster out of my AR-15.

110gr @ 2300 fps
125gr @ 2200 fps
135gr @ 2100 fps
150gr @ 2000 fps
168gr @ 1900 fps

So, I still have some more work to do. I hope this helps. I'll post again after doing some more testing.


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PostPosted: Sat Dec 31, 2011 11:18 pm 
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Thanks for sharing

The 300mp load data looks promising ...

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PostPosted: Sun Jan 01, 2012 12:58 am 
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I think the 300MP is going to work out well. I was not done working the 125gr TNT, and expect it should go over 2200fps with out any pressure signs. I'm just wondering how high it will go.


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PostPosted: Sun Jan 01, 2012 1:18 pm 
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JohnInNH wrote:
Here ya go... From Sierra..the Nosler is harder and may need caution i would start at just under 17 gr and work up. The max load may be a little more than the whisper loading.

Bullet 125 gr Sierra SPT
10“ 1:10 whisper
POWDER N110

1700....1800.....1850......1900.....1950.......2000
13.7 gr.15.1 gr..15.7 gr..16.4 gr..17.0 gr..17.7 gr

Accuracy load N110 16.4 gr
Hunting/power load 17.7 gr

H110/W296 start at 16.3 gr/1800 fps up to 19 gr/2000 fps


Just laddered up a load to 18 gr, which is slightly compressed. Compressed loads are pretty common in 7.62x39mm from what I've read, so I'm not too concerned. I'll watch for pressure signs for sure, and the 700 is a pretty strong action.


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PostPosted: Sun Jan 01, 2012 2:20 pm 
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You may want to try adding a few rounds with a tad more 18.3 and 18.5 gr just to see what is the top.

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PostPosted: Mon Jan 02, 2012 10:42 pm 
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dbrown wrote:
Subsonic out of an AAC 9" upper. 208 gr AMAX with 10.7 gr of H4198. Cycled and locked back on last round. Average velocity was 985. Temperature was approximately 55.

Sir,

What seating depth are you using for this bullet?

The measurements of 2.095-2.120" seem way too short.


OK also see 2.200-2.240 mentioned. That seems a bit better. I tried to get close to 2.120 and it was way too short.


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PostPosted: Wed Jan 04, 2012 10:43 am 
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Curious to see if anyone has tried a stick powder like IMR 4064.


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PostPosted: Wed Jan 04, 2012 10:52 am 
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I think IMR4064 would likely be too slow burning.

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PostPosted: Wed Jan 04, 2012 12:20 pm 
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cb4017 wrote:
WhoDat wrote:
Here is my load data close to what cliff developed:

130 grain pulled federal barrier blind sost
18 grains h110
Oal 2.050.... The crimp to the notch closest to the tip

No chrono data but primers looked fine and rifle cycles were fine

Out of a 16" DS arms chrome-moly barrel.

Had to shoot at 25m to sight my rifle in, but shots were on top of each other.


Looks good. I wasn't impressed with the accuracy when crimped in the bottom groove. I think I load a few crimped in the top groove and check accuracy. I'll load some of your loads and mine and try to chronograph this week.


Cliff,

Were you ever able to chrono those 130 gr sost with 18 gr h110 and Oal 2.04-2.05"?


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