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Thread: Trying something, Eric Cortina method of load development

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  1. #11
    Member
    Join Date
    Sep 2019
    Location
    Christchurch
    Posts
    88
    Soooo, some results...

    "Inconclusive" would be the one-word summary. Maybe my expectations were a bit high, but I'll need to do a bit more testing. A couple of good groups, but not yet Cortina's 'wide-node' of two consecutive small groups. In the end I did 8 different seating depths, in 0.003" increments (one was a 0.004" increment). All were seated with a Forster press-mounted die (it seems to give me the lowest run-out) to 2.190", measured with a Hornady gauge thingy. Then I seated to depth with a Wilson micrometer hand-die at the range, and measured each one.

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    I'm thinking I'll now try two steps closer to the lands (2.193 and 2.196") and repeat 2.168" and do two more steps that way (2.165 and 2.162).

    @JaSa - Yeah, I figure the velocity node is probably a bit below 45.5 given the trend. They are loaded with an RCBS Chargemaster, so +/-0.1grains is likely happening anyway.

    @Moa Hunter - Yup, there is much I don't understand too. I think Litz is onto it when he says we read far too much into very small data-sets - statistically the the good groups above could be just random occurrences.
    Tikka7mm08 and Moa Hunter like this.

 

 

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