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Rifles, Reloading, Optics, Equipment
Reloading
A question about the COW method and case size.
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<blockquote data-quote="Dean2" data-source="post: 2636657" data-attributes="member: 26077"><p>Well, for most any gun where I am much worried about total round count like those in the 7 RUM over bore range, 100 to 150 brass is about all you need to wear out a barrel. On top of that, I have successfully done load development at the same time that I was fire forming brass. That is how I know that many times the unformed loads are every bit as accurate as the fire formed loads. Even making 17 HH brass out of Privi 22 H and 338-378 out of 460 Bee brass, the first firings of the formed brass made excellent starting load tests. I typically load those first test sies of rounds starting halfway between min and max, using .005 off the lands and getting progressively shorter. That load series gives completely formed brass after the first firing, and gives me group data, COAL data etc to work with.</p><p></p><p>Not saying COW doesn't work, just trying to offer a different option that has worked very well for me over many years.</p><p></p><p>338-378 from 460 PRIOR to being fire formed. 460 to 378 seating (no stem) die ,to 378 FL, to 378 seating die (No stem), o 338-378 FL Die.</p><p></p><p>[ATTACH=full]400388[/ATTACH]</p></blockquote><p></p>
[QUOTE="Dean2, post: 2636657, member: 26077"] Well, for most any gun where I am much worried about total round count like those in the 7 RUM over bore range, 100 to 150 brass is about all you need to wear out a barrel. On top of that, I have successfully done load development at the same time that I was fire forming brass. That is how I know that many times the unformed loads are every bit as accurate as the fire formed loads. Even making 17 HH brass out of Privi 22 H and 338-378 out of 460 Bee brass, the first firings of the formed brass made excellent starting load tests. I typically load those first test sies of rounds starting halfway between min and max, using .005 off the lands and getting progressively shorter. That load series gives completely formed brass after the first firing, and gives me group data, COAL data etc to work with. Not saying COW doesn't work, just trying to offer a different option that has worked very well for me over many years. 338-378 from 460 PRIOR to being fire formed. 460 to 378 seating (no stem) die ,to 378 FL, to 378 seating die (No stem), o 338-378 FL Die. [ATTACH type="full"]400388[/ATTACH] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
A question about the COW method and case size.
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