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Always getting flyers

 
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  #1  
Old 05-27-2013, 12:36 PM
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Join Date: Oct 2011
Location: Bend, Or
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Always getting flyers

Any ideas as to why I'm getting flyers? They seem to be the same distance from the main group. First pic was shot last a week before the other two. Outside temp maybe 60 deg. Good cross wind.




Same load as above, shot one week later, but temp was 20 deg colder. Barrel never got warmer than luke warm. 6 shots total. First 2 shots, cold bore, were almost touching. 3rd shot was the 1st low flyer.




3 shots but bullet seated into the lands at 3.195" to ogive vs 3.175". Shot a few minutes after picture 2. Barrel never got hot but there was probably a 20 deg swing in barrel temp.




Primers are Fed 215 and seated with a hand seater that has a solid stop.
Once fired brass, 7mm mag bump die set to just touch shoulder and zero bump.
I re set the pan with every adjustment to the powder charge till the scale zeroes. Scale weight is verified with check weights.
I do notice that on occasion a cartridge will measure long from the bullet ogive to case base. I then adjust the press and continue seating till that cartridge measures within .001.
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  #2  
Old 05-27-2013, 12:47 PM
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Re: Always getting flyers

That second pic is screaming loose scope or faulty mounting system, or bad scope to me.

Jeff
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  #3  
Old 05-27-2013, 12:56 PM
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Re: Always getting flyers

I think Jeff is probably right.

You might also be loading in what is referred to as a scatter node.

Check this out
OCW Overview - Dan Newberry's OCW Load Development System
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Old 05-27-2013, 01:23 PM
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Re: Always getting flyers

If the scope was loose, would it return to zero in the middle of the string?
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Old 05-27-2013, 01:26 PM
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Re: Always getting flyers

Quote:
Originally Posted by WapitiBob View Post
If the scope was loose, would it return to zero in the middle of the string?
It could. What I see there is a "double group" situation. I have found that this comonly is related to an internal scope issue where the reticle is actually moving to two locations. But it could also be caused by a slight movement of a loose ring or scope base. Also I have seen this with less expensive mounts as well.

Jeff
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Old 05-27-2013, 01:35 PM
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Location: Bend, Or
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Re: Always getting flyers

thanks Broz. I'll look into that. Leupold mounts, not the twist kind, and greybull/leupold scope. They're all torqued down but I recall when I remounted the scope I think I went went lighter on the ring torque after reading some posts.
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Old 05-27-2013, 01:46 PM
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Join Date: Jul 2011
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Re: Always getting flyers

Did I miss the rifle details ? Those "double groups" look like a poorly bedded action moving with the recoil. I did see 73gr of powder and 180gr bullets noted, so there should be plenty of recoil. It would be about "standard" for a 308 Remington SPS with the plastic stock. If you do a search on you tube for "remington sps bedding job" you should find a few videos illustrating the problem.
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