Seating Depth Testing: Round Robin or All At Once?

[chop house]

at 200 over the hood of a pu . Close enough

well, if'n your jus' road huntin' mebbe. howzit do offa hay bale?

(you know i;m just poking you, right?)

 

[dgeesaman]

I don't understand this "Round Robin" approach...what can be learned from introducing all the extra variables ?

I've seen it used on the OCW load development process, which 'reads' the charge ladder target based on the position of the group centers not the size of the groups.

During that first charge ladder the center of the groups is more comparable if you spread the conditions out equally across all groups.

After that, normal group shooting works to finish refining the load.

 

[Alex Wheeler]

Typical long range 3 shot ladders are usually 12-15 shots. They are run as a group. Probably takes about 30 seconds. Whether you shoot them as groups or as round robin, it still only takes about 30 seconds or less. I would not shoot multiple groups over a time period round robin.

 

[mjl650]

I just got into long range shooting as well as reloading my own. Lot's of great info in this thread, my head is spinning but I'll get it figured out and enjoy doing it.

 

[JFrank]

well, if'n your jus' road huntin' mebbe. howzit do offa hay bale?

(you know i;m just poking you, right?)

Always
I gotta stack a couple bales ta get er jus right

 

[dsculley]

If the op's test was shot at 100 yds as I suspect then I doubt the wind is the culprit in the horizontal spread at 0.010". The vertical is about the same at 0.010" & 0.090". I would expect that a good load could be developed at either one of these seating depths. There is no information about the rifle or the use of the round, but if feeding from a magazine is an issue then 0.090" may be the better choice. If there are no magazine restrictions then it is up to the shooter. In this scenario I would probably test both seating depths to see how they develop, but I would be surprised if both were not more than adequate.

 

[JFrank]

Typical long range 3 shot ladders are usually 12-15 shots. They are run as a group. Probably takes about 30 seconds. Whether you shoot them as groups or as round robin, it still only takes about 30 seconds or less. I would not shoot multiple groups over a time period round robin.

I’m confused
Are you saying it takes 30 seconds to shoot 12-15 rounds or 3 rounds

 

[trailrider121]

I've tried both in round robin and all 3-rounds at once in testing groups. I prefer to shoot all 3 rounds in one sitting, trying not to change position, or cheek weld if possible. Trying to keep everything the same, so I get less deviation in testing. FWIT, that's my method.

 

[Winny94]

If the op's test was shot at 100 yds as I suspect then I doubt the wind is the culprit in the horizontal spread at 0.010". The vertical is about the same at 0.010" & 0.090". I would expect that a good load could be developed at either one of these seating depths. There is no information about the rifle or the use of the round, but if feeding from a magazine is an issue then 0.090" may be the better choice. If there are no magazine restrictions then it is up to the shooter. In this scenario I would probably test both seating depths to see how they develop, but I would be surprised if both were not more than adequate.

Wind was 5 mph @ 100 yards shooting a 7mm SS - I dont believe wind was a factor. I am shooting from a mag, so the .090" definitely takes any OAL considerations out of the equation, but Im not opposed to loading in the .010 range either if it shows potential as I have a short throat so I can load right up to the lands and still fit the mag. I dont want to get into the lands as pulling a bullet during a hunt would be a major issue. I am going to shoot it again and see what happens.

 

[Ringostar]

For your hunting rifle, I would stay with the longer jump. Work again within the .090 range. A little higher and lower. Then work on your powder at the seating depth that you choose. The 7 SS is close to the SAUM. You should be able to take SAUM data and reduce slightly to start.

 

[JFrank]

My 2c
I’d probably work with.090 area as long as it repeats and hits where you point it. Ya got meat