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Old 10-07-2018, 02:02 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, 03:53 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, 04:54 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, 05:20 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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Old 10-07-2018, 07:13 PM
bandofM1 bandofM1 is online now
 
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Rl-15
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  #6  
Old 10-07-2018, 08:19 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, 08:26 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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Old 10-07-2018, 09:16 PM
old sagarand old sagarand is offline
 
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As long as the hole in the target is where you are calling it, don't worry about the soot. AR's aren't picky with regards to powder.
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Old 10-08-2018, 01:56 PM
Gewehr43 Gewehr43 is offline
 
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Quote:
Originally Posted by old sagarand View Post
As long as the hole in the target is where you are calling it, don't worry about the soot. AR's aren't picky with regards to powder.
It’s not a question of which powder being used, but the charge of the powder being used.
If in fact the OP is light on his charges, it is an issue for SR..... within reason, you should get the highest velocities you can. At 200 and certainly 300yds the wind and drop start to be an issue. Accuracy trumps all but don’t leave FPS on the table for no good reason.

OP.... I would increase the powder charge and find the higher accuracy node. If you think you have light charge, you probably do.
I would also use one the “standard” powders for this...... no need to experiment. But at least go higher or better yet run your loads over a chrono and know for sure.
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Old 10-08-2018, 04:06 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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