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interpreting ladder test - need help!

 
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  #8  
Old 09-09-2013, 06:37 AM
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Re: interpreting ladder test - need help!

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Originally Posted by azsugarbear View Post
Typically, you shoot three targets when shooting a ladder test so that you can confirm nodes (or flyers for that matter). Do you have them, or did you shoot just this one target?
I shot only 1 target.
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Old 09-09-2013, 07:56 AM
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Re: interpreting ladder test - need help!

You can do it with just 1 ladder if you wish. I've done it that way.

I would load up 3 rounds each of 6, 7 and 8 and give those a try. Generally higher end loads tend to be more accurate but that's not always the case. If you think #7 might be a flier then it's worth looking here.

Also, H4831 and H4831SC tend to be "the" powder for the 270 Win, especially in 130gr bullets. If you e-mail Barnes they will send you a pdf with more powders than just the 2 listed on their website. Unfortunately the load data on their website is quite limited.

Are you using a chronograph?
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  #10  
Old 09-09-2013, 07:58 AM
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Re: interpreting ladder test - need help!

It's very risky drawing conclusions from a single target. A flyer, small change in wind, or slight increase in the powder charge of a single round can skew the results of a single target. I think that is what you may have going on here.

Usually, nodes are pretty easy to spot. A second target confirms the results of the first. You have a couple of options: #1) Use your existing target and assume a node in #6-#8 range and confirm by shooting groups of three rounds. If this is a node, all three loads should group well and all should print in the same area of the target. Or #2) re-shoot your ladder using at least two targets.
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  #11  
Old 09-09-2013, 09:29 AM
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Re: interpreting ladder test - need help!

Quote:
Originally Posted by Dr. Vette View Post
Also, H4831 and H4831SC tend to be "the" powder for the 270 Win, especially in 130gr bullets. If you e-mail Barnes they will send you a pdf with more powders than just the 2 listed on their website. Unfortunately the load data on their website is quite limited.

Are you using a chronograph?
Doc,
I can't find H4831 or SC anywhere. If I could find H4831, I would try it.
Yes, I was using a chrono, a Magnetospeed to be exact.
I've got a Barnes manual with all the powders.
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  #12  
Old 09-09-2013, 04:48 PM
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Re: interpreting ladder test - need help!

You don't want to use anything attached to a barrel you're load developing with.
Go by charge amount alone for ladder.

Also, have you determined best seating depth yet?
If not, and if you're at bad seating, ladder results can get pretty hard to determine.

Are you prefouling 1st?
Are you timing your shots?
What scope are you using?
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  #13  
Old 09-09-2013, 08:02 PM
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Re: interpreting ladder test - need help!

Quote:
Originally Posted by Mikecr View Post
You don't want to use anything attached to a barrel you're load developing with.
Go by charge amount alone for ladder.

Also, have you determined best seating depth yet?
If not, and if you're at bad seating, ladder results can get pretty hard to determine.

Are you prefouling 1st?
Are you timing your shots?
What scope are you using?
I haven't played with seating depth. I'll do that to fine tune the grouping after I find a node.
Yes, I'm prefouling before shooting the ladder.
I'm shooting a shot, then loading a single shot, getting lined up and firing.
On my 270 I'm using a Nikon 4.5-14x40 scope with a BDC reticle.
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  #14  
Old 09-10-2013, 10:23 AM
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Re: interpreting ladder test - need help!

I find I have to wait 3-5 minutes between shots to keep the barrel from getting hotter than I'd like, even with my 270. And yes, I time them.
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