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Rifles, Reloading, Optics, Equipment
Reloading
Kirby Allen’s “no load development” load development method.
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<blockquote data-quote="Bart B" data-source="post: 696223" data-attributes="member: 5302"><p>'Twould be nice to see some actual pressure measurements (CPU or PSI; whatever system one has) on Kirby's cartridges. I mention this as most cartridge brass starts extruding back into bolt face cutouts/holes at around 65,000 to 70,000 CUP. </p><p></p><p>If a 1.5 to 2 percent change in powder charge weight is 2 grains, that means the charge weight's in the 100 to 150 grain range. I think the spread in peak pressure across several rounds will overlap what a 2 grain drop's average will be below the average of the heavier load. In comparing standard loads to proof loads in cartridges, there's a much greater difference in charge weights for the same bullet used than 2%.</p></blockquote><p></p>
[QUOTE="Bart B, post: 696223, member: 5302"] 'Twould be nice to see some actual pressure measurements (CPU or PSI; whatever system one has) on Kirby's cartridges. I mention this as most cartridge brass starts extruding back into bolt face cutouts/holes at around 65,000 to 70,000 CUP. If a 1.5 to 2 percent change in powder charge weight is 2 grains, that means the charge weight's in the 100 to 150 grain range. I think the spread in peak pressure across several rounds will overlap what a 2 grain drop's average will be below the average of the heavier load. In comparing standard loads to proof loads in cartridges, there's a much greater difference in charge weights for the same bullet used than 2%. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Kirby Allen’s “no load development” load development method.
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