AR with heavy 22" kriegger

Discussion in 'AR15/10 Rifles' started by orangeride, Mar 5, 2011.

  1. orangeride

    orangeride Well-Known Member

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    I'm getting .92" to 1.45" 5 shot groups at 200 yards with Nosler and Sierra 69's. Should I be expecting better? Or am I doing ok? No bullet or case sorting. Lapua brass. Rem 7.5m primers. 2.250"OAL. Its typical to get 3 shots almost touching then have 2 mess things up. Could it be the primers?
    SMK 24.5 gr varget
    Nosler 24.0 VVn-140
     
  2. ICANHITHIMMAN

    ICANHITHIMMAN Well-Known Member

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    Sounds great how fast are you shooting the groups?
     

  3. orangeride

    orangeride Well-Known Member

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    That's a good question! I was at the range sat and my crono quit working. If I had to guess I would say around 2800fps. What are your thoughts on the fliers I'm getting? Could it just be the inconsistency's of how a semi auto locks up? Or should I keep working on my load?
     
  4. ICANHITHIMMAN

    ICANHITHIMMAN Well-Known Member

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    Well you missunderstood my question. How long between shots (time wise) are you giving your barrel to cool?

    Your load sounds great but if you where shooting real fast and your barrel went from cold to hot this would explain your flyers.
     
  5. orangeride

    orangeride Well-Known Member

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    Yep. I did miss that one. I have a pretty uniform testing method. From a clean barrel I'll fire three to foul and warm the barrel, then I'll fire 5 with 1-2 min between shots. At the end the barrel is just warm, not hot. I've tried shooting groups slower but it didn't seem to change anything. Thanks
     
  6. milanuk

    milanuk Well-Known Member

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    Something else to be 'aware' (as in conscious) of is whether one of your 'fliers' is the first round from a mag, or the last. Some folks claim they can tell a difference on target...
     
  7. orangeride

    orangeride Well-Known Member

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    That's a good point. I always load 5 in the mag and Im wondering if when the rifle locks open on the last shot if that's changing the harmonics of the rifle.
     
  8. woodnut

    woodnut Well-Known Member

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    Orangeride, the Kriegger barrels are know for being very accurate. I like that you're shooting 69s; but you didn't say what the twist is; or I missed it. It sounds like your firing sequence is good; starting with foulers and paying attention to heat. May I ask if you have wind flags? Shooting at 200 yds. will give the wind time to affect the flight. Mirage will too. And I agree with you, chronoing the loads will give a lot of info. Hope this helps and good luck ! Charles
    PS- I doubt very much it's the primers or brass as you're using the best. Lockup probably isn't it either. Are you running the AR wet or dry? Best is wet. My bet is the wind/ mirage is the culprit.
     
  9. lazylabs

    lazylabs Well-Known Member

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    Might try just loading a single round by hand and shooting with no magazine at all. If the rounds are getting beat up or seated further while firing it could cause problems.
     
  10. Hntbambi

    Hntbambi Well-Known Member

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    I have occasionally seen a difference in POI from releasing the bolt manually (first shot) compared to the rest of the magazine. I would take one shot off target, then let the gun cycle normally for the next 5 shots for record. It may be cheating, but it seemed to work. Isn't consistency the key to accuracy?
     
  11. orangeride

    orangeride Well-Known Member

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    My barrel is 1-7.7". I finally got my crono working and did some primer testing. My 69 SMK load is 24.5 gr varget, lapua brass and Rem 7.5 primers. With unsorted brass and bullets, I had an average extreme velocity spread of 43 FPS per 5 round group shot. I then sorted the bullets and brass and that got me down to 20 FPS. The funny thing was the best group I shot that day, was one where the velocity spread was closer to the 43. I have rounds loaded with Fed and Cci match primers, but I've been waiting for a day for the wind to let off. I'll post with my results after I test the other primers. I would assume in the end the load with the most consistent velocity will be most accurate.
     
  12. woodnut

    woodnut Well-Known Member

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    Orangeride, I think you answered your own question about vel./accuracy. Yep, not always is the most consistent vel. the best accuracy. You proved that. But, most times it is. I really think you should switch primers to the 7 1/2s. When you get into pressures; they rule. They are also very, very consistent. I won't shoot anything but those in my ARs. Keep us informed as to your progress,ok?
    Charles
     
  13. lobo56

    lobo56 Member

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    This may be a dumb question, but is this 223 or 308>?
     
  14. BigSkyGP

    BigSkyGP Well-Known Member

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    I'd say based on bullet weights plus small rifle primers, and such 223/5.56.