Observations / report on Reformed 7.62x39

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  • Observations / report on Reformed 7.62x39

    Played with some Remington Small Primer and Lapula 7.62x39 while I have Winchester I do not have enough the quantity size of the Rem and Lapula which is why I did not include them .
    Sample size is 100 ea 3 loadings (1 is fireforming) this 4th loading with Hornady Dies and Sierria 120s.
    Used Caliper vs Micrometer for ease and speed
    Neck Thickness is calculated by Neck dia - .264 /2

    a. Lapula lost to splits neck 1year ago loss rate is 6 thus far leaving 94 serviceable.
    measuring the neck dia after reloading range from .289 to .295 with a average of .291. STD DEV is .0011 ---- thickness of .0125 to .0155
    b. Remington 2 (both in fire forming) to split necks with 4 firings. Neck dia measurments with bullet loaded .288 to .2985 with a average of .2891. STD DEV is .00164 ------Thickness of .012 to .0172
    Control Lots (new) :
    Les Baer 264 brass neck dia .287 to .293 STD DEV .00116----- thickness of .0115 to .0145
    Alex -Arms 6.5 Grr Brass neck dia .2895 to .291 STD DEV .00027---- thickness of .0127 to .0135

    Normally I would have attributed the STD DEV and neck thickness to the splitting but the Remington Brass exceeded the Lapula in variation.
    My thoughts are simply the brass composition itself the Lapula being harder. I might have saved a bit more of the Remington Brass by annealing before resizing as it was once fired. The Lapula might have needed annealing after the fireforming which was zero loss. After Fireforming both brands exhibited doughnuts in the neck the Remington being a bit less pronounced as the shoulder area is not as thick.
    Any way just thought I would share what I have observed from both brands as a alternate source of brass vs Hornady (aka Les Baer) and Lapula (aka Alex-Arms) 6.5 Grr
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