Veritical stacking of rounds. What does it mean?

[BLUESGUNNER]

I was shooting a batch of test rounds I developed the other day and one of my groups produced a perfectly vertical stack. About 2" high. All of the other test groups had normal grouping. What does this mean if anything?

 

[Bindi2]

If you have a tuner on I would say your barrel is not quite in tune.

 

[BLUESGUNNER]

All of my other groups were sub 1" MOA. This one just stood out as odd.

 

[Bindi2]

what range. That can be and still out of tune.

 

[Dusty Stevens]

Gun not settled in too hard bags or a loose rest knob. Or it could be muzzle heavy

 

[Gary in MD]

I’ve had that happen with too hard of bags as Dusty said. Can also come from pulling the rifle back differently to your shoulder each shot, Load out of tune, etc.

 

[dgeesaman]

If it’s a sporter make sure you front sling stud isn’t touching the rest

David

 

[Capt. Oblivious]

If it’s a sporter make sure you front sling stud isn’t touching the rest

David

group killer this

 

[Mulligan]

I have seen the same thing from a trigger that was sensitive to the cold. In other words, when the trigger got cold it would not operate reliably. Sometimes the delay in firing pin fall was painfully obvious. At temps in the 20’s it stopped working all together.
CW

 

[BLUESGUNNER]

This was using a lead sled at 100 yards. 6.5 Grendel. I am not familiar with the "tune" concept.

 

[Dgd6mm]

My suggestion, to start, quit using the sled for starters. Then check the mentioned possible culprits that others have posted.

 

[Larryh128]

This was using a lead sled at 100 yards. 6.5 Grendel. I am not familiar with the "tune" concept.

My GUESS is that it came from the lead sled. While they can be helpful sighting big boomers, the rifle needs to move under recoil, sounds like it isn't. That will for sure make groups vertical. Never use any additional weight on it either, good way to break a stock.

 

[Dusty Stevens]

Lead sled is a stock breaker for sure- and a heart breaker trying to shoot groups

 

[JFrank]

Was it the first group or the last group that went vertical

 

[Bc'z]

Was it the first group or the last group that went vertical

I think I know where you're going with this...

 

[BLUESGUNNER]

Wow...I have never heard that about a lead sled. I HAVE been getting random results while using it though. My ES has been oddly erratic when suing it too. The stacked string was group number 3 of 5. The barrel had been cleaned prior to this test.

 

[BLUESGUNNER]

Group one had a ES of 5. All the others were around 75. crazy.

 

[JFrank]

Lead sleds are questionable for the type of testing your doing. Personally I can’t tell ES from BS nor do I care’ nevertheless the vertical could come from several area’s. (Try the Search function top right corner)
Move on with a traditional rest and bag set up and note when you see it again.
There are plenty of excellent people /members to help with this.
J

 

[TAJ45]

Lead Sled.....boooo hiiissss. Hope you have lotsa hair. You'll need it.

 

[Fast14riot]

I have a charge weight test target that had groups go from scatter, to a perfect vertical string, to perfect horizontal string, with .3 difference in charge weight. Sometimes it can just be harmonics.