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Load Testing Which Group to Use?

 
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  #8  
Old 07-15-2012, 08:22 AM
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Location: Central, KY
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Re: Load Testing Which Group to Use?

I just loaded up 10 of 43.5 and 10 of 45gr last night. I'll shoot them this week @ 200 to see how they look.
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  #9  
Old 07-16-2012, 07:08 PM
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Re: Load Testing Which Group to Use?

I don't think there's enough shots per test group to be meaningful. 3-shot groups are only about 50% reliable to reflect what their load will do all the time.

Shoot at least 15 shots per group. They'll be over 80% meaningful.

Basic rule of meaningful accuracy is to shoot enough shots with a given load so every time you do it, the groups are all the same size. If all the groups of a given load ain't the same size, you're not shooting enough shots in each group for it to be 100% meaningful. So 15 shots per group is good and 20 even better. For example, instead of shooting four 5-shot groups with a load, shoot all 20 shots into the same group.
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  #10  
Old 07-17-2012, 01:22 PM
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Re: Load Testing Which Group to Use?

Quote:
Originally Posted by Bart B View Post
I don't think there's enough shots per test group to be meaningful. 3-shot groups are only about 50% reliable to reflect what their load will do all the time.

Shoot at least 15 shots per group. They'll be over 80% meaningful.

Basic rule of meaningful accuracy is to shoot enough shots with a given load so every time you do it, the groups are all the same size. If all the groups of a given load ain't the same size, you're not shooting enough shots in each group for it to be 100% meaningful. So 15 shots per group is good and 20 even better. For example, instead of shooting four 5-shot groups with a load, shoot all 20 shots into the same group.
I basically agree.

But if you're at 3 MOA on your 4th shot, 15 or 20 shots won't make the group any smaller.

-- richard
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  #11  
Old 07-17-2012, 01:53 PM
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Location: Central, KY
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Re: Load Testing Which Group to Use?

I just shot 7 shots each with each load @ 200 at the back yards testing facility.....



Results:

43.5gr.
2599 cold bore
2616
2617
2611
2617
2595
2598

5 shots went into a .942" group with 2 flyers making it 1.975" group



45gr.
2664
Error
2700
2690
2700
2702
2708

this one shot two .5" 3 shot groups about .5" away from each other with 1 flyer. Group size 1.962".



They are not very consistent in the .5 MOA area but they do stay under 1 MOA. And I know pulled at least 2 of the shots.

After I was done @ 200 I dialed the scope back down 1.75 MOA for 100 yards and the 43.5 gr load put 3 in the same hole again.

I think there is a variable out of wack somewhere that's working against me here. If I can put my finger on it I may be able to hang on to the .5 MOA groups.

Keep in mind that my rifle is a stock Remington 700 SPS glass bedded in the choate stock.
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  #12  
Old 07-17-2012, 02:37 PM
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Re: Load Testing Which Group to Use?

I hope nobody's in the house or walking around the corner while you're shooting.
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  #13  
Old 07-17-2012, 02:54 PM
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Re: Load Testing Which Group to Use?

Quote:
Originally Posted by rscott5028 View Post
I hope nobody's in the house or walking around the corner while you're shooting.
That's a storage garage behind the house. Not our main garage....... just like anywhere else when the range is hot, nobody's allowed in the back yard.
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  #14  
Old 07-17-2012, 05:46 PM
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Join Date: Dec 2008
Location: Boise IDAHO
Posts: 838
Re: Load Testing Which Group to Use?

I admit I am reluctant to even mention it........but............pulled shots happen but if you have two out of seven or even two out of fourteen pulled shots from the bench with a rear bag. You should probably check your rig. Fine tune the fit. LOP and cheek hight or slop in the bipod. Choate stocks are easily adjusted so don't settle for less than a perfect fit . Just reluctantly thinking out loud.............D
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