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  #1  
Old 10-07-2018, 03:02 PM
Beeks Beeks is offline
 
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Default Ar15 load development

I just finished my first season of service rifle competition with the new AR. I shot the M1 the last few years. I need to develop better ammo. I am shooting lake city brass sized to 223 out of a 556 chamber. Lighter loads are giving me better accuracy but I'm getting a lot of soot on the outside of the brass. I'm assuming this will foul the chamber causing fliers. Does this have anything to do with 223 ammo in a 556 chamber?
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  #2  
Old 10-07-2018, 04:53 PM
Belltower0351 Belltower0351 is offline
 
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It's nothing to do with 223 vs 5.56. The brass is the same size. If you are using light loads, the brass may not be expanding enough to seal well. What load are you currently using and what chamber do you have?

There are many well-proven service rifle loads. What components are you working with?
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Old 10-07-2018, 05:54 PM
Beeks Beeks is offline
 
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Lake city brass
Hornaday 68g hpbt
I tried a variety of powder charges with shooters choice precision powder. The best groups were 23.4g and 22g. The powder is comparable to Varget. At 24g the soot disappears and groups start opening up.
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Old 10-07-2018, 06:20 PM
Belltower0351 Belltower0351 is offline
 
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I bet if you keep increasing the charge, you will find a higher node with good accuracy.
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  #5  
Old 10-07-2018, 08:13 PM
bandofM1 bandofM1 is offline
 
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Rl-15
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  #6  
Old 10-07-2018, 09:19 PM
Gewehr43 Gewehr43 is offline
 
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As others have said: this has nothing to do with 223 vs 5.56.......instead the light load is not sealing properly.
There are NUMEROUS proven loads for the AR. Instead of another odd powder, use Varget, H4895 or R15 and be done with it.
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Old 10-07-2018, 09:26 PM
Roadkingtrax Roadkingtrax is offline
 
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Even Black Hills reman 77s come out sooty at times. No one would accuse Black Hills of being lightly loaded.
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  #8  
Old 10-08-2018, 05:06 PM
Beeks Beeks is offline
 
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Our league is compensated to 100 yards. For this reason I wasn't overly concerned with velocity. I wish I had a chronograph. I was using varget. I switched on an effort to reduce costs so I could afford to practice more. I'll try bumping up the charge a bit.
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  #9  
Old 10-08-2018, 07:54 PM
Gewehr43 Gewehr43 is offline
 
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Then yes, you are more than likely on the lower accuracy node. Work your way up and you should find accuracy returns. Watch, of course, for over pressure etc.
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Old 10-09-2018, 02:26 PM
k98dave k98dave is offline
 
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Are you using any crimp when reloading? I see some of that using GI brass when crimping with collet (aka factory) crimp die. Much less if no crimp at all. Also noticed commercial brass seems to expand better to seal
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