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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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.
 
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.
 
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.
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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?
 
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…
 
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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