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6.5X284 grouping question

 
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  #8  
Old 08-19-2012, 10:56 AM
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Re: 6.5X284 grouping question

If you can figure out your velocity, and you are happy with it, I would work on your current load. Your short and long range groups are looking pretty good, and tuning up the seating depth, and working with fire formed brass may put you in the sweet spot. Getting a handle on velocity and determining ES should be a priority at this point.
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  #9  
Old 08-19-2012, 11:11 AM
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Re: 6.5X284 grouping question

I will load up a few more at different seating depth with same charge and chrony them again to see if its close to what i measured, dont have my notes in front of me but think my es was more than 40, but going to try to get my father-in-laws chrony and put it in line with mine to have 2 sets of eyes on it and see what we get. Will the seating depth effect velocity much if any if you not into the lands on either?

Thanks for the help guys.
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  #10  
Old 08-19-2012, 11:31 AM
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Re: 6.5X284 grouping question

Tail winds can and do turn into fishtails, shifts from 5 o'clock to 7 o'clock are difficult to detect. Catch a calm day before you start screwing with your system. An 8 mph wind fishtailing from 5 to 7 will yield about 3.5 inches of dispersion on the 6.5-284 at 300 yds.

Last edited by Augustus; 08-19-2012 at 11:34 AM. Reason: More info
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  #11  
Old 08-19-2012, 12:04 PM
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Re: 6.5X284 grouping question

One other thing I haven seen talked about yet is weighing your brass. Any loading for my 308 Palma rifle. I weigh my brass into +or- 2 gr groups. I have found with brass that weighs the same gives you a tighter group.
Rhino55
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  #12  
Old 08-19-2012, 12:18 PM
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Re: 6.5X284 grouping question

I will weigh the brass and get 3 of the same weight and load them and see if it helps, didnt know the tail wind would do that, thought it wouldnt change it much at all thanks alot.
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  #13  
Old 08-19-2012, 12:59 PM
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Re: 6.5X284 grouping question

If the wind is a perfect 6 o'clock wind it will have no measurable effect at 300. The problem is the nature of wind, it's velocity and direction is usually variable to some extent. Fishtails will screw you over and are very hard to detect, trust me on this one, your groups are pretty good for the conditions you described.

Also you were worried your ES might be causing vertical dispersion. You think your ES is around 40 fps, this will cause about one third of one inch vertical dispersion with your set-up at 300 yds.
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  #14  
Old 08-19-2012, 01:06 PM
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Re: 6.5X284 grouping question

What is an accepted ES on velocity if your going to shoot at 1000-1200 yards, would love to get it to single digits but not sure where i should be happy at.
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