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Semi-Auto / AR-15 grouping question

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  #1  
Unread 11-27-2008, 01:43 PM
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Join Date: Apr 2006
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Semi-Auto / AR-15 grouping question

I was shooting some different loads today in my AR-15 and got some interesting results. With the same load I was seeing two distinct groups form. I believe that this is due to variations in chamber-time, or the time the round sits in the chamber warming up before firing. Is this a common thing to happen with semi-auto fire?

Elevation was pretty much the same but the two groups are about 1.5" apart. Taken by themselves, the 3 shot group is around .5" and the two shots grouped to the right are .375".

These 5 rounds were all loaded the same:

24.5gr Varget
75 grain Hornady A-Max
2.260" Cartridge OAL

Thanks in advance
Rob
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  •   #2  
    Unread 11-27-2008, 04:02 PM
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    Join Date: Jan 2008
    Location: SOCIALIST CONTROLLED TERRITORY OF NEW YORK
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    Re: Semi-Auto / AR-15 grouping question

    need a lot more info?

    ie. twist rate,range,manufacture,rest used as many details as possable.
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      #3  
    Unread 11-27-2008, 07:41 PM
    gbp gbp is offline
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    Join Date: Aug 2006
    Location: California
    Posts: 227
    Re: Semi-Auto / AR-15 grouping question

    Are you using a free float assembly?
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