New Ladder test

Discussion in 'Reloading' started by Preda8or, Jul 20, 2008.

  1. Preda8or

    Preda8or Well-Known Member

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    Ok guys here is another ladder test, 8 twist 22-250 this time with 80gr A-max's bullets H-4350 powder and each test was shot on different days, all three days 1 to 3mph wind mostly calm at 300yds and again no chronograph available. Tell me what my load is? [​IMG]
     
    Last edited: Jul 22, 2008
  2. steve4102

    steve4102 Well-Known Member

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    36.8 grains
     

  3. tx_shooter

    tx_shooter Member

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    I'd say retest the low end of the 36 bracket. I noticed that on one test you test from 35.8 to 37 and on the other one you test from 36 to 37.4 gr.

    I think from the targets your nodes are around the low 36.2-4 range. This is where the testing gets harder... do a couple test with .1 grain differences. The smaller cases will show the difference with .1gr changes.
     
  4. boomtube

    boomtube Well-Known Member

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    I agree with the above accessement of the right target. Unfortunantly, that isn't confirmed by the left target! Including your first targets, I see no indication of any "sweet spot" or node in your tests thus far.

    Perhaps your limited range of charges isn't wide enough to find a node. Or, just as likely, that powder and bullet combo simply isn't working in your rifle.

    I doubt that load increments of .1 gr. will help until you get a better grasp on what works.
     
  5. royinidaho

    royinidaho Writers Guild

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    Hmmmmmm,

    Well here goes. First I'd say you're another one who missed the dime;)

    Second I"d say your target was at 300 yrds? If it was closer than that I'd say that powder/bullet/seating depth/primer combination isn't the best of matches.

    I really couldn't "see" a correlation/repeatability between the two targets to be able to pick the powder weight that would be best.

    Just my thoughts.

    Good to hear from you again.
     
  6. Preda8or

    Preda8or Well-Known Member

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    Yes 300yrd. Going to try to run another test in the morning
     
  7. Preda8or

    Preda8or Well-Known Member

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    I thought the best way to find seating depth was after you find powder charge?
     
  8. Derek M.

    Derek M. Well-Known Member

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    That is my method.

    Just taking into consideration what is available from the target, I would take 6 rounds of each of the following, shooting 2 three shot groups:

    36.2 x6 rounds
    36.4 x 6
    36.8 x 6
    37.0 x 6

    I would shoot the 36.4 and 36.8 groups first.
     
  9. tx_shooter

    tx_shooter Member

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    The only problem with waiting till you have maxed your pressure finding your node is that when you start changing your seating depth you start changing your pressure too. I had to redo a load when I adjusted my seating depth for some 168s. It seems the depth of the bullet will throw your pressures high real easy. So I find the bullets preferred seating depth - do some load testing - tune a node - retest the depth up and down a little... then shoot the heck out of it.
     
  10. Derek M.

    Derek M. Well-Known Member

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    This idea is cogent. We should do what works. For me, if I begin with the bullet seated at the lands, my pressures are usually at their highest, as they should be. This leaves me with one direction to tune, and that is to seat deeper, where consequently, the pressures tend to drop. If in fact I can get a better load with a bullet seated deeper and pressure drops, I can always add more powder to see if the load can be tuned even more.

    My problem is I tend to get lazy once my loads are in the .4 range and under at 100 yards.
     
  11. royinidaho

    royinidaho Writers Guild

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    Interesting thread.....

    Pred8or keep us going!
     
  12. Derek M.

    Derek M. Well-Known Member

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    Cogent:

    1. convincing or believable by virtue of forcible, clear, or incisive presentation; telling.
    2. to the point; relevant; pertinent.
    3. appealing, or makes reasonable sense.
     
  13. royinidaho

    royinidaho Writers Guild

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    I really didn't know that:rolleyes:
     
  14. Preda8or

    Preda8or Well-Known Member

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    Third ladder test added to first page. Fire at will
     
    Last edited: Jul 23, 2008