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Semi-Auto / AR-15 grouping question

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Old 11-27-2008, 01:43 PM
Junior Member
Join Date: Apr 2006
Posts: 3
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
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Old 11-27-2008, 04:02 PM
Platinum Member
Join Date: Jan 2008
Posts: 4,388
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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Old 11-27-2008, 07:41 PM
gbp gbp is offline
Silver Member
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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