Help anilizing latter test and group results

[jca57jd]

Hey guys I'm shooting a ruger precision 6.5 creedmoor with a 24" barrel, nosler brass, 140 amax, and fed 210 primers. All brass is fire formed with the shoulders bumped back .002" with .002 neck tension, weight sorted, and trimmed to same length within .001". Bullets are all sorted by weight and length to ogive.

Here is a latter test at 300 yards that I did 2 weeks ago shooting h4350 with 140 amax (.015" jump, oal to lan 2.237") coal of 2.856. From my readings I thought it looked good from 43.3 - 44.2. What is your opinion?

Velocities
41.5 - 2628
41.8 - 2658
42.1 - 2674
42.4 - 2687
42.7 - 2720
43 - 2740
43.3 - 2770
43.6 - 2785
43.9 - 2803
44.2 - 2827
44.5 - 2844
44.8 - 2854

 

[jca57jd]

I went out yesterday and shot these 4 groups at 300 yards round robin style (the atmospheric conditions were very similar).
Velocities
43.3 - 2781,2761,2765
43.6 - 2767,2780,2761
43.9 - 2793,2785,2799
44.2 - 2789,2807,2798

I'm extremely disappointed. Where or what would you do from this point?

 

[rcoody]

I went out yesterday and shot these 4 groups at 300 yards round robin style (the atmospheric conditions were very similar).
Velocities
43.3 - 2781,2761,2765
43.6 - 2767,2780,2761
43.9 - 2793,2785,2799
44.2 - 2789,2807,2798

I'm extremely disappointed. Where or what would you do from this point?

well 43.3 and 43.9 look like they have about an 1.5" vertical spread. That is under .5 moa.

It is your horizontal that needs work. Could be wind but most likely it is you. Practice!!!

 

[Bart B]

I think they're all the same, statistically speaking. You've not shot enough rounds for each load for any to have any confidence of representing what all rounds for a given load will shoot.

Check out post #3 in the following:

http://www.longrangehunting.com/forums/f28/308win-load-help-160478/

 

[Lefty7mmstw]

I think they're all the same, statistically speaking. You've not shot enough rounds for each load for any to have any confidence of representing what all rounds for a given load will shoot.

Check out post #3 in the following:

http://www.longrangehunting.com/forums/f28/308win-load-help-160478/

Bart tells it like it is here.... 3 shot groups tend to produce "screamer" groups... you've got to put 5, or better, 10 shots at a given charge weight into a target at a given range for any real certainty. I like to shoot multiple smaller (3 or 5 shot groups)groups and average them with my hotter chamberings.

That'll separate the wheat from the chaff in a hurry.

In my last 7stw barrel, I didn't make a move on the rifle and opt to work the barrel over until I had averaged accuracy data from 400+ rounds in 3 shot groups at various ranges. I elected to retire the barrel as it had both a headspace issue and the barrel threads were cut undersized for the receiver as it had been opened up when trued. We never knew about the threading issue before we opened the rifle up as I bought the rifle on the used market... No matter, the new barrel is averaging less than half the group size that the old barrel produced...