Which group is best?

nksmfamjp

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All same powder charge. Three different distance to lands.

So, which one?
 

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Pdyson

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40 is ok, 50 off is terrible and 60 off is best. I would look for a optimal depth around that .060 off group. load at least 5-more sets 3-thou apart. 3-shot groups should should be good. I would load .054, 57, 63, 66, and 69 off. See if you can get two adjacent good groups. If not, go plus minus around the .040 off group. I would go no closer than 020 off the lands on a hunting rifle.
 

nksmfamjp

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This is my second round of testing 50 off was best, but shooting 5 groups of 5, it didn’t repeat. Now I have these 3 to choose from for a long range session in a week or so.
…..was thinking 40 off myself, but then go back to charge when I have more time.
 

QuietTexan

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You can turn the W/H function on in the app and it gives you overall width and height measurements for the groups.
WH.png


X2 on shooting at 0.035 or 0.030 if you haven't already.

Shot #5 in the 0.060" group is only a flyer if he calls it before he sees where it's at on paper. Otherwise it's a valid member of the statistical population and ignoring it simply because it appears anomalous in the the 5-shot group is most likely hiding the true group size at a reasonable confidence interval.
Captureasdf.JPG


 
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NW Hunter

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Vancouver, WA
You can turn the W/H function on in the app and it gives you absolute width and height measurements for the groups.

X2 on shooting at 0.035 or 0.030 if you haven't already.

Shot #5 in the 0.060" group is only a flyer if he calls it before he sees where it's at on paper. Otherwise it's a valid member of the statistical population and ignoring it simply because it appears anomalous in the the 5-shot group is most likely hiding the true group size at a reasonable confidence interval.
View attachment 293696

The op never gave us any information on good shots or bad shots.
Nksmfamjp, how bout it?
 

nksmfamjp

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The op never gave us any information on good shots or bad shots.
Nksmfamjp, how bout it?
All are as good as I can shoot. I can shoot a rifle pretty well. My shooter induced error is under 0.25 moa on a bad day and probably 0.1 moa on a good day , I would estimate.

That said, I didn’t feel really great shooting that day…I was maybe 95%. My grip was messing with me. Basically, I took some careful dry fires and my crosshairs jumped 0.25 moa….I calmed down, looked through my fundamentals and got my dry fire jump near 0 moa….maybe 0.1 moa.

Still, I caught my grip in odd places at times after recoil.

I also try to wait a min between shots, but honestly my best consistency is one right after another. I was letting my natural cadence take over….maybe a shot in 25 sec.

The rifle should handle that. It has a #3 Brux, action bedded to a bedding block stock. It should handle some heat…
 

MagnumManiac

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Feb 25, 2008
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4,201
Group #4 is the best group….the reason is that there is no vertical or horizontal.
I would fine tune going .005” above and below with another round of 5 shot groups.
Then, with whichever is the tightest group, shoot a 10 round group and take note of the velocity and work out your ES/SD numbers.

Cheers.
 

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