SD and extreme spread?

[bangstick]

I went to the range today to do a seating depth test for my wife's 6.5-284. I had three depths .015, .030,.045. The only one that shot good was .015 off lands. At 100 yards it shoot 4 shots in a dime. But the SD was 29 and ES was 13.2. Does a guy just stay with this group based on group size and leave it alone ? Or is the sd and es to high and start over or tweak ? I don't know what to do at this point

 

[Csafisher]

What did the other groups look like?

 

[jpd676]

Go shoot that load at distance and see how it does.

 

[cowboy]

Holes in paper don't lie - chronographs can fool you. Shoot that same rifle-load etc over one of the new Garmin Chrony's and the SD will be less. Labradar and Garmin use different algorithms to calculate their SD's.

 

[bangstick]

What did the other groups look like?

Not good. Three inch group with one and 2" on the other. Reading on the other two groups.

 

[bangstick]

Go shoot that load at distance and see how it does.

Holes in paper don't lie - chronographs can fool you. Shoot that same rifle-load etc over one of the new Garmin Chrony's and the SD will be less. Labradar and Garmin use different algorithms to calculate their SD's.

ok. I also thought about going .3 up and down in powder also. But i will definitely take it out to distance and try it again. So 3-400 yards and shoot a group?

I just feel so lost when a guy cuts paper like that and the numbers ain't good.

 

[The Oregonian]

ES and SD on a five shot string is nothing to be alarmed about. Get about 25 shots in there if you want a more statistically significant group.

 

[Grizzman47]

How many rounds were in the shown group? If it's 5, and it can be duplicated, and if it groups really well at 200 plus yards, then I'd happily ignore what my chrono says.

 

[ShtrRdy]

An SD of 29 and an ES of 13.2 don't make sense to me. Usually ES is larger than SD.

Personally I would put in more time with the accurate load and see how it does at longer distances.

 

[MagnumManiac]

ES only matters beyond 600, if you plan to shoot to less than this then the numbers mean diddly…

Cheers.

 

[bangstick]

How many rounds were in the shown group? If it's 5, and it can be duplicated, and if it groups really well at 200 plus yards, then I'd happily ignore what my chrono says.

It was actually 4

 

[lancetkenyon]

Try primer testing. It can make a big difference.
Then adjusting neck tension. From .004 to .001.

 

[Korhil78]

An SD of 29 and an ES of 13.2 don't make sense to me. Usually ES is larger than SD.

Personally I would put in more time with the accurate load and see how it does at longer distances.

He has it switched. It was actually an ES of 29 and SD of 13.2. If you look at the chrono in the pic, you can see it.

 

[Tiny Tim]

Too small of a sample size. Put more rounds down range at various distances. 50 fps difference for a slow load in my 6.5 CM is about .5 moa at 500 yards (roughly 2.5 inch vertical).