243 winchester ladder test results - need some help

[mgrunloh]

I'm still fairly new to this and was looking for some advice as to which of the below loads you guys would go with?

Would you choose load 5, 6, or 8. None of the groups were fabulous, however it was quite windy, but these 3 also stood out as good.

I was thrilled with the load 8 standard deviation of 2.3 and a 6fps extreme spread, but the 5-6 "node" sure does have some promise with low s.d. and e.s. between the 2.

 

[Zen Archery]

Absolutely 8

 

[Tiny Tim]

Load 8 looks good, but seems to be a narrow band (velocity is climbing). Loads 6&7 seem to be in a flat spot. Your last velocity in load 7 seems abnormally low for yhe string. I'd shoot that again and possibly try the center of the two. Should be forgiving. 5 shots gives a good base, but 25-50 will show much more.

 

[Aoudad 101]

My load 42. Gr h4350 105 3060 fps

 

[jrock]

What's your group data like? I don't base my workups solely on velocity.
I don't like to pick narrow bands of data. They are susceptible to small changes. Your wider band of "good" would be near 42.2.
Pick a narrower band to retest around and watch what your grouping does and try to correlate it to the velocity data. I had a .243 that shot with an ES of 25 and always grouped better than the the 0.5 grain higher load that had half that ES.

 

[RegionRat]

Looks promising in general. I can see some details in the spreadsheet header. What kind of rig and barrel profile is this?

 

[Doom2]

Where are the targets?

 

[mgrunloh]

Browning xbolt sporter contour in McMillan stock Timney trigger and suppressed

 

[Doom2]

Looking at the loads below 42.1 I would say your pressures and case fill are low. At 42.1 they are starting to come into the more reasonable range.

 

[upacreek]

What program are you using?

 

[mgrunloh]

Just a labradar and an excel spreadsheet I found from somewhere.

 

[ncwg2boatguy]

That's pretty impressive with Win 760. I didn't know it would drop numbers like that. I've never had good luck with it but hadn't tried it in 243

 

[SteveBurton]

What program are you using?

That spreadsheet is from 6.5 Guys website. Load Development Analysis

I also like Chronoplotter for its simplicity.