Ladder test

[ubet]

Here's my results from a ladder test today. The sweet spot appears to be 23.6-24.2. This was out of a sionics upper, 14.5" at 475 yards, 77gr smk hpbt, bipod prone, with pstii 2-10. What grain do you think I should go with. Was thinking 23.9 to cut it through the middle. What say you?

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[Uni-Vibe]

I'm sorry, I'm not understanding this at all. What are you trying to show or accomplish?

[ubet]

I'm sorry, I'm not understanding this at all. What are you trying to show or accomplish?

To build a load the rifle likes. I'm wanting to know if I should just take it at the middle, 23.9gr or work it again. I'm just wanting it to hold moa at 500yds

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[Jammer Six]

Took me a while to understand ladder tests. Once I did, I wondered why I didn't think of it.

[sidewaysil80]

I thought this test was done to test/confirm accuracy of turret adjustments on a scope/optic. Can someone explain what this test does for reloading?

[mark5pt56]

You are looking for nodes to where you have little change between charges. In my opinion, you should either do 23.7 or 24.1. You have two nodes there and that would split it with whatever node you choose. Typically not a platform one would be doing a ladder with but seems accurate enough. Do 10 each and shoot 2 groups of 5 of the 23.7/24.1. One target for each charge weight, mark each group and see.

When I do a ladder, I usually shoot 2-3 per weight to rule out any inconsistencies. You can also use a sharpie and color the bullets to tell apart. You may have to use a Q-tip and alcohol to run through the hole and the color will bleed onto the Q-tip. I just use red, green and blue and one unmarked with max of 4 on each target. If more that 4, just use another target, on same level and plot the shots afterward by drawing horizontal lines and also showing center for each charge weight. It's almost a hybrid of the two methods.

[mark5pt56]

I thought this test was done to test/confirm accuracy of turret adjustments on a scope/optic. Can someone explain what this test does for reloading?

One would do a Tall Target Scope Test for that to test tracking. There's basically two test for charge weight, Ladder or Optimum Charge Weight.

[ubet]

The bullets were colored, something I learned from here. I had built three of each load, ran three groups of tests, but the first two didn't turn out. My paper wasn't big enough and aiming point wasn't high enough so I didn't get all shots on paper.

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[ubet]

Here's the ocw test. I found it in another post of mine.

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