Ladder Test Analysis

Bolt guns, gas guns and long range shooting tactics.
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Erik
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Ladder Test Analysis

Post by Erik » Sun May 23, 2010 8:17 pm

Wanted to ask you guys for help. Here is the test I ran:

Remy 700 SPS 26" 1-12
168g SMK
IMI Match Brass
IMR 4064
91*
1300
7-10 MPH gusts
Distance: 200yd. 300yd was too hard to see hits. I had no help.
Load Range: 39.8-44.7
Increments were .3 of a grain, which yeilded 17 rounds.

Image

#1 and #2 were shot at 300yd and I determined that it would be too hard to see. It looks like 6,7,8, and 10 grouped really nice. The "U's" were unknowns. I don't know how I missed the one by the x but I did. Do you guys see anything else or advice on what should happen next?

Below is my best group at 300 (at 1.60 from edge):

Image

I loaded 50 of those rounds at 41.4 which would fall between my #6 and #7 load. Any ideas?
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privateer
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Re: Ladder Test Analysis

Post by privateer » Sun May 23, 2010 9:29 pm

I would re-run the test on a good day, going from #4 to #8. Or just load up 5 rounds each of #4 to #8 and see how they do. Or try a chronogragh.

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Dave P
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Re: Ladder Test Analysis

Post by Dave P » Mon May 24, 2010 8:13 am

The ladder test (promoted by Creighton Audette) is a great method!

From the first target, 678 is the obvious answer. Definately shoot some more of them. Also see that 45 are the same elevation (that is all we care about). So maybe 45678 is a better answer.

And don't forget, the whole idea of Optimum Barrel time is to allow some charge weight variations in each round, with no change on target. That means you do not need to measure each charge - just dump them out of a good thrower - saves all kinds of time!


And I suggest you shoot less rounds per target (like 10). Much easier to keep track of them.
Go Trump!

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