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25-06 Ladder Test

 
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  #1  
Old 11-24-2012, 12:14 PM
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25-06 Ladder Test

Recently did a Ladder Test for my 25-06. I have been using H 4831 SC with varied results so thought I would try some Retumbo.
Using a 115 gr VLD and a CCI 250 Primer seated at .010 Jump.
I thoroughly cleaned the barrel and fired two fouling shots (usually only takes one) Then I started at 53.5 gr at 300 yards.
I think I have a nice node at 54.5-56 grains with less than 1" of verticle.
I have 5 rounds loaded at 55 and 55.5 grains that I will test next week.

1) 53.5
2)54
3)54.5 Shots 3,4,5 formed a 1.2" triangle and shot 6 was same elevation
4)55
5)55.5
6)56
7)56.5
8)57
9)57.5
10)58
11)58.5
12)59

1 is the bottom shot
2 is just above it
3,4,5 are the most right triangle up about 3"
6 is about 2" to the left of 3,4,5
7 is up 1.5 inches
8 is back down and just left of 3,4,5
9 is above 6 and to the left of 7
10, 11, 12 are from the bull up

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  #2  
Old 11-25-2012, 03:25 AM
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Re: 25-06 Ladder Test

Nice...I actually had the opposite of your test. I had varied results with Retumbo and switched to H4831SC. 54 gr of H4831SC will get me 1/2 MOA out to 700 yards if I do my part.

Lets us know how your final test goes. Sounds like you have a good load in the making.
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  #3  
Old 11-25-2012, 09:36 AM
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Re: 25-06 Ladder Test

my best load with H4831SC was 54.3 gr. I would get 1/2 MOA one day then the next day it would shoot 1 moa. I tried Fed 210M, CCI 200 and CCI 250 primers with basically the same results. The ladder test I did with the H4831SC revealed a node between 53.5 and 55 very similiar to the retumbo test so not sure if retumbo is the answer yet.

gary
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Old 11-26-2012, 07:39 AM
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Re: 25-06 Ladder Test

I don't understand why folks think a single shot hole represents where the center of a many shot group will be. Therefore, why do folks just shoot 1 shot for each load for a ladder test?

What if a 20-shot group for a given load is twice as large as the vertical separation of two shot holes each with a different powder charge?

Please help me out; I'm ignorant in these things.
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  #5  
Old 11-26-2012, 10:39 AM
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Re: 25-06 Ladder Test

Bart, each shot represents a different load weight. When you get a "group" with varying loads it typically is a "node" in the barrel that represents a sweet spot.

When developing a load it is faster and easier to load 10-14 different charges instead of 3-5 of each charge. If I loaded 3 shots at each load I would have had to fire 36 shots to learn what I learned from 12 shots.

These are the 5 shot groups at 200 yards from the two loads that looked best from the ladder test. Not sure what happened with shot 1 on the 55gr load.
I had some swirling winds this morning, started out straight down range then from left to right then coming at me. Only about 5-7 mph though.



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  #6  
Old 11-26-2012, 11:06 AM
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Re: 25-06 Ladder Test

Quote:
Originally Posted by 8andbait View Post
Bart, each shot represents a different load weight. When you get a "group" with varying loads it typically is a "node" in the barrel that represents a sweet spot.
But each shot doesn't represent the center of a group of many shots of that same load.

The bigger a many-shot group is for a given load, the least reliable a single shot of that load represents where its center is.

Ladder testing is based on the assumption that a single shot represents the center of a many-shot group with that load.

I tried a lot of ladder testing a long time ago when it became fashionable for testing loads. Not as good as shooting a single 20-shot group with each load.

I don't believe it represents any node in the barrel. Too many barrels of different shapes and lengths I've seen have shot the same lot of ammo into no worse than 3 to 4 inches at 600 yards. None of those barrels had the same "node."
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  #7  
Old 11-26-2012, 11:26 AM
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Re: 25-06 Ladder Test

understood

gary
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