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Need help interpreting results!

 
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  #1  
Old 06-24-2010, 12:38 PM
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Join Date: Sep 2009
Location: SW MT or noVA
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Need help interpreting results!

Hey,

I was just out shooting my .308win with 208 A-maxs and RL17. I need some help with the results....

I shot all the shots through my chrono.

All brass, powder charge, seating depth and neck tension were the same, I only whiched primers.

Foulers (CCI BR2 Primer)
2640 2645 2661 2640
ES: 21
SD: 9
AVG: 2646

CCI BR2
2640 2650 2640 2656 2635 2656 2650 2640
ES: 26
SD:?
AVG: 2645.5

Fed GMM210
2656 2666 2645 2682 2666 2656 2656 2661
ES: 37, 10 (excluding two shots I think went whack)
SD: ?
AVG: 2661, 2658 (exclu. 2 shots)

I shot 8 (4 and 4) took a break then repeated. All shots logged in order of shooting, shot one primer then the other throughout.

Now, the Fed is looking promising with those two shots not counting (I was using brass that I hadn't prepped as well as I usual do).

I only have one target in front of me right now with 2 4-shot groups one of each primer. At 200 yards the CCI has 3 clustered at .6" and one i pulled (called it). The Fed has two distinct pairs (about .4" CTC in each pair) but 1.2" of vertical between them. The two pairs are strung horizonally. It is two shots above two others.

Now, which primer would you use based on my results?

I will go shooting again in 2hours ( I love summer vacation )

Oliver
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Old 06-24-2010, 01:26 PM
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Re: Need help interpreting results!

Bump not much time left till leaving for next session! I have loaded 15more with fed 210s no bullets seated yet.. In my match brass this time. Will see if that removes the annomalies from my velocity data. Will shoot at 200 and 300.

Any other suggestions?
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Old 06-24-2010, 09:11 PM
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Re: Need help interpreting results!

let us know i am also useing the 208 in my 308 but not sure that im happy with it yet. I used FED 215 primers which seemed to work better for me but even after shooting a 3"group at 550 im still not convinced.
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Old 06-24-2010, 09:42 PM
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Re: Need help interpreting results!

Fired my 15 loads with Fed 210Ms and things really fell apart. Crappy grounds and high ES... I will upload pics of targets tonight or tomorrow morning. Also tried some 175smks with RL15 and also shot bad. I believe my bore was just very fouled up after so many rounds down the tube.
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Old 06-25-2010, 07:10 AM
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Location: Rapid City, South dakota
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Re: Need help interpreting results!

Interesting read. Try annealing your case necks. Your getting one or two each time that seems to be out of whack with the others. Could be bullet neck tension doing it. What was the temps when your shooting.
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Old 06-25-2010, 10:09 AM
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Re: Need help interpreting results!

Me thinks your having too much fun shooting. I'm attempting to overcome a similar addiction.

After the barrel is broken in, clean after every so many rounds, the rifle will tell you how many that is. I clean after twenty. WipeOut and/or Warthog with no brushes. 5 passes usually does it.

I guess you're working for consistency and lower ESs.....

"At 200 yards the CCI has 3 clustered at .6" and one i pulled (called it)." High ES must be the problem here?


"The Fed has two distinct pairs (about .4" CTC in each pair) but 1.2" of vertical between them. The two pairs are strung horizonally. It is two shots above two others." Here I'd suspect variations in cheek weld and/or shoulder pressure. Possibly bipod loading if your using one.

Another thing that may be revealing with this load would be to vary the powder charge up and then down on both sides of the current charge. I've found that at times a '|' shaped group can be changed to a '--' shaped group by changing powder weights. Some where in the middle is a '*' shaped group.

If successful with this method be cautious of the narrowness of the node. Usually this doesn't give the consistent results of the OCW method.

Have a fun summer! Summers are too short. Heck, life is too short. Enjoy it!
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  #7  
Old 06-25-2010, 12:05 PM
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Re: Need help interpreting results!

I really LOVE RL17 for its low SD's and the wonderful groups I get with it out of my 6.5-284 LRH. BUT, it requires cleaning after every 20 rounds. Shoots as well on shots 1 and two as it does on 10-11-12. no difference. After about 25-30 flyers every 3-4 shots apparently due to fouling, barrel will just look nasty, clean it and problem dissolves with the carbon fouling. If a very clean burning powder is necessary for you I would try VV N160 or H4350. My 6.5 doesn't like H4350 but does well with N160. Both burn very clean in all of my rifles suited to them. cleaning every 20 shots is no problem for me, but it may be for you. Just my experience, others may differ.
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