Modern Sporting Rifle Evolution
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His$Her277

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Reply with quote  #1 
Was thinking about attempting a supersonic load using 115 SMK’s and 115 Nosler CC’s on top of CFE 223. I know it’s a slow powder and may not produce appropriate pressures but I don’t see any data ~ maybe for good reason.... Could try in the 10” AR or the 16” Bolty.... Thoughts? Concerns? Thanks for any info.
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Gusmeister

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I see nobody else jumped in on this one.  I burn a lot of CFE 223 in 223/5.56, 6.5 Grendel and 308 but none in 277 WLV.  CFE 223 is probably way too slow for the WLV.  Don't know if it will simply launch bullets slowly or if you'll have ignition problems.  Maybe this will tickle somebody else with more knowledge to jump in.  
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RangerJoe

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Reply with quote  #3 
CFE223 is rather slow, especially for such a short pipe.  Do you have any A-2200?  That worked VERY well (excellent accuracy) for me with bullets in the 115gr range from 16" bbl.
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His$Her277

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Reply with quote  #4 
Ok just have some preliminary results. My chrono took a dump as I started.

20gr CFE 223 115gr HPBT.

Would not cycle the 8” AR 1:11
Cycled and locked back the bolt on the 10” AR 1:7
Resulted in sub MOA from the 16” Bolt 1:7

Not gonna powder up until I have chrono results.
So far seems to be an “ok” (subjective) load.
Will have some more data hopefully by this weekend.

Oh and no pressure signs at all. Primers looked great and no signs of case expansion.

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Gusmeister

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Reply with quote  #5 
H&H

You have already done better than I expected.  Looking forward to your velocity numbers and results from this weekend.
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His$Her277

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Reply with quote  #6 
Well the results are in:

At 20 grains my velocities were far to slow to even be considered an adequate load. I decided to powder up to 22 grains CFE 223. I only used the bolt gun for testing purposes as it is the only one with a 16” barrel.

Load Data:
115 grain Sierra Match King HPBT
22 grains CFE 223
CCI 450 magnum primers
Starline once fired WLV brass
Case trim 1.530
COAL 2.140

Avg Velocity 1,765 FPS

Shot to shot
1886
1759
1748
1682
1750

As you can see this is far less than acceptable speed and therefore I won’t be playing with CFE 223 anymore. I will however give props to the 3/4 MOA this load resulted in. I was quite surprised with the spectacular accuracy of this load considering the wide variance in shot to shot velocity. When compared to only 21 grains of 1680 with an average velocity 2400 FPS and considering I was on the verge of compressing the CFE load, it is far more feasible to just use 1680. I’ll post my 1680 load data and results as I tinker with it more.

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jpeg DA3CFC67-536D-4D96-9311-C0BFC126C3C3.jpeg (56.08 KB, 2 views)


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Gusmeister

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Reply with quote  #7 
Thank you H&H,

Good data.  I really had no idea what you'd end up with.  Now we all know.

Thanks again
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