Reducing ES on 10 shot groups

[Jerry Snyder]

I dusted off the 6 Dasher yesterday and used my Garmin chrono to log some info. I was happy with the group sizes, about .5 MOA. The velocity were what I expected, also the SD's. The ES were a little high for the group size/SD numbers. What would you suggest to reduce the ES numbers?

 

[Straightshooter1]

I dusted off the 6 Dasher yesterday and used my Garmin chrono to log some info. I was happy with the group sizes, about .5 MOA. The velocity were what I expected, also the SD's. The ES were a little high for the group size/SD numbers. What would you suggest to reduce the ES numbers? View attachment 1653371

How about, weighing your brass and setting aside the outliers for sighters or 1st shot fouling and maybe also keeping have batches of those brass verily close to the same weight???

You can also improve your SD's by weighing primers and culling the outliers.

 

[noahburleson1]

I dusted off the 6 Dasher yesterday and used my Garmin chrono to log some info. I was happy with the group sizes, about .5 MOA. The velocity were what I expected, also the SD's. The ES were a little high for the group size/SD numbers. What would you suggest to reduce the ES numbers?

Try standard primers (non magnum)

 

[swd]

I’d shoot it at distance and if the groups hold up don’t worry about it.

 

[Codyway]

In no particular order
1. High precision powder scale, weigh to 0.01 gr
2. Sort primers by weight, batch in 0.02 gr increments
3. Primer seating depth. Consistent depth at the optimum depth for your gun
4. Ensure fire control group is not dragging
5. Sort bullets by bearing length

 

[Clancy]

Not wet tumbling are you? What did you do for seating depth? How forgiving was your original load?

 

[LCazador]

Try different seating depth and bullet tension. If that doesn't improve ES try a different powder or a different powder charge. As mentioned before sort brass by weight, bullets by ogive, and assure all primers are seated to same depth.

 

[Jerry Snyder]

Not wet tumbling are you? What did you do for seating depth? How forgiving was your original load?

Dry tumble only, I use a Wilson Micro seater/chamber die. I changed the seating depth by10 thou closer to the lands per advice from a well known shooter on here. Thanks

 

[Clancy]

Dry tumble only, I use a Wilson Micro seater/chamber die. I changed the seating depth by10 thou closer to the lands per advice from a well known shooter on here. Thanks

I’d do a full seating test before I went any farther. It’s definitely the most important.

 

[LCazador]

Dry tumble only, I use a Wilson Micro seater/chamber die. I changed the seating depth by10 thou closer to the lands per advice from a well known shooter on here. Thanks

10 thou closer to the lands is a pretty aggressive change. Try moving 3 thou at a time. You can easily skip right over a node moving 10 thou at a time.

 

[L.Sherm]

10 thou closer to the lands is a pretty aggressive change. Try moving 3 thou at a time. You can easily skip right over a node moving 10 thou at a time.

100%

 

[RabbitSlayer]

Shoot strings of 25 to 50 so your 10 shots numbers seem tiny!

 

[R.Morehouse]

Leave the carbon in the necks, just run a nylon brush straight in and out the same amount of strokes ( before sizing ), be anal about your COAL.......Lots of good suggestions here.....Good Luck

Regards
Rick

 

[Fuj]

Leave the carbon in the necks, just run a nylon brush straight in and out the same amount of strokes ( before sizing ), be anal about your COAL.......Lots of good suggestions here.....Good Luck

Regards
Rick

Yeah.....I covet the brass on it's forth firing. I do not tumble. I just
wipe off the brass as it comes from the chamber to get the soot
off the necks. and like Rick mentioned, I use a nylon brush to just
go in and out. Nothing aggressive.....Note when seating your bullets,
If one feels it seated on the hard or soft side, set those aside for
foulers or initial sighters......I'll also like to ask if your annealing ??
If not, add that to your to do list.

Side thought.....Did you do the initial primer pocket uniforming on
the new brass ?? Only need to do it once, then done.

 

[L.Sherm]

Leave the carbon in the necks, just run a nylon brush straight in and out the same amount of strokes ( before sizing ), be anal about your COAL.......Lots of good suggestions here.....Good Luck

Regards
Rick

Once I started doing this I could "feel" the seating alot more consistent.

 

[jpjulian]

Just go shoot. Life's too short........

 

[SKWERLZ]

I’d shoot it at distance and if the groups hold up don’t worry about it.

This

 

[Jerry Snyder]

Yeah.....I covet the brass on it's forth firing. I do not tumble. I just
wipe off the brass as it comes from the chamber to get the soot
off the necks. and like Rick mentioned, I use a nylon brush to just
go in and out. Nothing aggressive.....Note when seating your bullets,
If one feels it seated on the hard or soft side, set those aside for
foulers or initial sighters......I'll also like to ask if your annealing ??
If not, add that to your to do list.

Side thought.....Did you do the initial primer pocket uniforming on
the new brass ?? Only need to do it once, then done.

Yes, using an AMP Annealer, will look into primer pocket uniforming.

 

[swd]

Dashers like pressure, you might consider pushing it a little harder and see if a higher node does better.

 

[Jerry Snyder]

Dashers like pressure, you might consider pushing it a little harder and see if a higher node does better.

I will try a few 5 shot groups with a one tenth grain, two tenth grain and 3 tenth grain increases this week.