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Ladder test target, and how to interpit it

 
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  #8  
Old 04-04-2005, 09:01 PM
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Re: Ladder test target, and how to interpit it

I would run 67.8,67.9,68.0 and 68.2 check for ES and SD. If the velocity is what you want, go with it.
db
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  #9  
Old 04-04-2005, 09:04 PM
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Re: Ladder test target, and how to interpit it

[ QUOTE ]
257speed
I have never seen this before, would you be willing to e-mail a copy of how it works and how to do it, Please.

[/ QUOTE ]
Mine is a little different from that that toby describes. In this case I used .3gr. I can email mine if you like.

[ QUOTE ]
b1g_bore
Note when I do this I have a Std-Dev column too. (which is really required) and maybe an extreme Spread.

[/ QUOTE ]
I usually measure for ES when I shoot my "confirmation" groups to pick the charge from the node. Its kinda hard to get ES or SD from one round [img]/ubbthreads/images/graemlins/grin.gif[/img]

Roy in Idaho, did you use my method?
[ QUOTE ]
BTW is there a prize for the one that pick's em out.

[/ QUOTE ]
Yes there is, and it goes to Jimm. the prize is a years supply of ammo in your favorite caliber. Jimm, you have 10 seconds to reply. [img]/ubbthreads/images/graemlins/grin.gif[/img]

[ QUOTE ]
4ked
Thanks abinok. I am going to say that load #13 is the load of choice because there is a pattern seen in loads 11 thru 15. 13 is in the center of that pattern. The pattern is a jump up from 11 to 12 then a slight decension from 12 to 13 to 14 then another jump up from 14 to 15. The pattern is a morror image of it's self with 13 being in the center of the image. This would show a harmonic tuning in and back out of the influences you wrote about in the email.

[/ QUOTE ]
Exactly! maybe I should give a second prize.....

[ QUOTE ]
Brent

If those were your actual MV's and not just what you predicted I would be checking out and loading for 2660-2720 fps and see if the wind changing spread the group wide and the #10 shot was a fluke hitting high like that. 2680-2700 seems to be the target and would offer the most resiliancy.

If that didn't work out I'd load for 2600 fps or maybe try another powder.

BTW, how far away was the target? 300 yards?

[/ QUOTE ]
Brent, I wish I could have had the chrony up and running... just too late in the day [img]/ubbthreads/images/graemlins/mad.gif[/img] Its interesting you point out the velocity window. My previous load was 73gr of H1000 at 2690. I was hoping to move up the velocity scale with the faster powder, and I did a little. Yes the target was shot at 300yds. I usually shoot my "confirmation" targets at 400, but decided to shoot these at 300 as well, just so yall can compare all the targets to each other more easily.
Any way, enough suspense here's the target.
Top row is the #12 load
second row is the #13 load
third row is the #14 load

The average velocity of the six shots was 2741fps
I don't put a lot of emphasis on SD, but ES was 14fps
Groups for the #13 load measure .636ctc, and .437ctc
I decided to post this ladder test instead of the other two I still have all the targets for because it just happens that the best load seems to be smack where the theory says it should be. If only it were always that simple!!!
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  #10  
Old 04-04-2005, 09:17 PM
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Re: Ladder test target, and how to interpit it

Looked at this till my eyes went crossed.

Did some measuring, very rough of course...

Let me know how close I am. It would be a good calibration of my "measurement" system.

If the only difference between #s 1 & 2 are elevation and wind then the wind is worth a bit over an inch.

The lower group is kind of symetrical assuming hold for wind was spot on.

Upper group is about 3.7" above the first. That's a big jump unless the target is well beyond 100 yds.

Horzional dispersion of the upper group is about 2". That says the wind was having a decent affect on the process.


If #s 10 & 16 are thrown out due to some bullet defect or some other excuse such as flys, snakes, wife yellin' atcha etc., Vertical dispersion of the upper group is about 0.9"

Within that 0.9" are shots 12, 13, & 14 with a vertical dispersion of about 0.4" and they are consecutive shots.

So my semi-emperical, swag is that somewhere around the powder weight of #13.

Also if the velocities were "actual" there's room for more powder and there may be another "node" starting w/#16. Ya just gotta chase that velocity. Don't cha? HeHeHe

That's my story and I'm sticking to it this time. [img]/ubbthreads/images/graemlins/mad.gif[/img]
[img]/ubbthreads/images/graemlins/smile.gif[/img] [img]/ubbthreads/images/graemlins/smile.gif[/img] [img]/ubbthreads/images/graemlins/smile.gif[/img]
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  #11  
Old 04-04-2005, 09:19 PM
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Re: Ladder test target, and how to interpit it

Well damn, I posted a bit late. Just my luck.

Well at least I get to see the results.

Thanks for the experience. Think its good.
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  #12  
Old 04-04-2005, 09:27 PM
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Re: Ladder test target, and how to interpit it

Well pat me on the back. I'm thinkin I'm gettin' the hang of it.

Yes, I did use the ladder method.

Sorry it took so long for me to do my calcs, but I got a late start. Now ya probably think I cheated. But I have the photoshop and MapInfo GIS files to prove I did the work.

Have a good evening and thanks again.
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  #13  
Old 04-04-2005, 09:52 PM
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Re: Ladder test target, and how to interpit it

Holy moly Roy!
photoshop and MapInfo GIS?
maybe I should be more sophisticated... I just go Hmmmm..... then go load some more ammo. [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]
Im glad to hear that you had some success with this method. Its one of those that isn't heard of very often, but its such a great tool!! Sure were dark days back when it took a box of bullets, and a pound of powder to find a load for the 300WM. Course, did the store still have the same lot of both when you went back a month later for more componets..... almost never. So its back to developing more loads.... Now I usually have a workable load in less than half that, and then chrony the rest as I shot them to establish an acurate average, and ES!
I Love It!!!
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  #14  
Old 04-04-2005, 10:32 PM
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Re: Ladder test target, and how to interpit it

[ QUOTE ]
Exactly! maybe I should give a second prize.....

[/ QUOTE ]

Yep, I'm "da man". My prize will be finding my load in less rounds when I order those fancy shmancy wildcat bullets thereby giving me more rounds to confirm drops and practice with.

I would like you to post the other targets you mentioned with an explanation of which load you chose and why so if my ladder test dosen't come out as obvious as this one I will have an idea of how to read it. If it isn't too much trouble.

Or better yet, I will post pictures of my first ladder test to get your advice on reading it. (It will be a while. My wallet has to reinflate it's self after our trip to shoot with the MOAG gang.)
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