Which group is best?

[nksmfamjp]

All same powder charge. Three different distance to lands.

So, which one?

 

[Idaho Lefty]

Personally, I'd Re-Test, the Middle group to see IF, the #5 shot, "Flyer",.. "disappears".
But, ther's nothing wrong with, the First Group on the Left.
I'd say that, the group gets bigger with, MORE than,.. .040 "Jump"

 

[Ol' Red]

Try one and two again. Like Idaho Lefty said #5 in group two looks like a flyer.

 

[Recon$$]

Agree I'd run 2 again.

 

[Pdyson]

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]

60 off is best

Why is 60 off best?

 

[nksmfamjp]

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.

 

[Pdyson]

Why is 60 off best?

Shot 5 is a flyer. It held tight for the first four shots…could be related to barrel heating

 

[NW Hunter]

I'd try .035 and .065 off the lands, maybe even .030 and .070 off.

.050 is a scatter node so I would stay away from it.

.040 and .060 are getting close to good nodes but are not quite there.

 

[QuietTexan]

You can turn the W/H function on in the app and it gives you overall 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.

Precision & Group Size – Statistics for Shooters Part 3

This article is going to dive into the most effective ways to quantify the precision of a rifle and...

precisionrifleblog.com

 

[NW Hunter]

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

Precision & Group Size – Statistics for Shooters Part 3

This article is going to dive into the most effective ways to quantify the precision of a rifle and...

precisionrifleblog.com

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

 

[Longtine88]

I'd reload the 0.060". Then I would load 0.065" and 0.070" and see what they did.

 

[nksmfamjp]

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]

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.