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Input wanted on a ladder test

 
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  #1  
Old 09-11-2011, 03:40 PM
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Input wanted on a ladder test

I did a ladder test with my 6.5 x 55 using the 130 Accubond and RL 22 in WW cases with 210M primers. The rifle began as a Ruger 77 but now wears a Schneider barrel and a Brown stock. This rifle is a sub 3/4 MOA shooter (sometimes WAY sub). The test was fired at 200 yards. The ladder started with 47.3 gr RL 22 and went up in 0.3 gr increments to 50.0. 50.0 is pretty clearly max. The bullets hit in a clockwise pattern until I reached shots 8, 9 and 10. I am thinking that is the node. What do you think? Here is a picture of the target.
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  #2  
Old 09-11-2011, 03:53 PM
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Re: Input wanted on a ladder test

Yes, there is some info there, but I am just not seeing the distinct pattern.

There is such a wide variation for a 200 yard group, that something else may be happening here. 2 1/2" verticle dispersin between shots 1/2/3.

4/5/6 only 1" verticle, but 2" horizontal.

#7 is up in the north 40 with #3.

8/9/10 are 1.2"ish x 1.2" ish as well.

Did you run these over a chronograph as well? Would be interested in seeing the numbers there.

On another note, not every barrel likes accubonds for some reason. Some will shoot half MOA, others in the 2 MOA range - but either will hold the same across distance. Weight sort and bearing length sort the bullets by chance?
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Old 09-11-2011, 04:11 PM
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Re: Input wanted on a ladder test

This rifle likes the 120 Ballistic Tip over 45.5gr of IMR 4350 and the 140 Partition over 47.5gr of RL22. Both are running right at 2800 fps (the 120 is a touch faster).

The rifle has a #3 barrel so it is a bit on the light side.

I did not chronograph it. I did not weight sort bullets or brass.

The rifle did not behave like I would have expected. The first 8 shots hit in a clockwise pattern. The last 3 show the only real group which is .65 MOA.

We had a very calm morning and I was shooting from a concrete bench with a rest rear bag. 10x scope.

Shoot a few more between 49.4 and 50.0?
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Old 09-11-2011, 04:41 PM
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Re: Input wanted on a ladder test

I would probably repeat the test once or twice more just to be sure that it's consistent.

A chrony would be very handy if you've got one available.

Otherwise, I tend to agree with your analysis based on this very small sample.

-- richard
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Old 09-11-2011, 04:42 PM
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Re: Input wanted on a ladder test

If you haven't found best seating depth yet, I'd test for it with ~#4 load, and then re-run the ladder.
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  #6  
Old 09-11-2011, 05:20 PM
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Re: Input wanted on a ladder test

Quote:
Originally Posted by Mikecr View Post
If you haven't found best seating depth yet, I'd test for it with ~#4 load, and then re-run the ladder.
Why #4?
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  #7  
Old 09-11-2011, 05:39 PM
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Re: Input wanted on a ladder test

Quote:
Originally Posted by DZelenka View Post
Why #4?
I can't speak for Mikecr. But as acloco pointed out, 4-5-6 might be a node and 8-9-10 might be a node. But, it's really hard to say for sure when you're dealing with small samples.

And, it's not clear what role if any the wind or general accuracy played.

I like to stick orange dots on my target to give me several aim points and shoot 2 or perhaps 3 shots at each dot for each powder level and then compare the tightness of each group as well as the relative POI.

-- richard
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