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Rifles, Reloading, Optics, Equipment
Reloading
Does new brass shoot differently than fire-formed brass?
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<blockquote data-quote="Rardoin" data-source="post: 2074481" data-attributes="member: 114954"><p>As most posts have noted, you will likely have some charge variation in new vs fired brass for a given velocity. But, it will likely be close. In example I developed a fireforming load for 7 Sherman Short mag/190gr A-tip that was precise enough at 1000yds to win some very competitive F-class matches...shooting High Master scores and setting a range record. My fully formed load charge weight was .2gr different. That's all. This is blowing the shoulder forward from 30 to 40deg and taking 80% or so of taper out of the body in the process of fire forming; that is much more case capacity change than you will experience by a long shot. I think you will find a load quite easily that is very close to virgin brass assuming the neck were expanded in the same degree when prepping. As far as loading in advance....there a lot of talk of 'cold welding' of the bullet to the neck. If you ammunition is kept in an environment that has humidity control and reasonable temp control you can load it months in advance. The U.S. F-class National teams that compete in the world championships load many months in advance in order to have ammunition shipped out to the host country and cleared through customs well in advance of the matches. I have loaded up .270 ammo for a caribou hunt that sat in a pack in the back of a closet in my home for 12 years. I found it, tested it at 100yds and it shot the same as it initially did. My father has a .338 WM that was his father's. He also had the original box of 200gr ammo that was purchased with the rifle that was used once on a moose hunt in the Yukon in the late 1950's. About 4 years ago he shot a 3 shot group at 100yds that was very close to .75" using that ammunition. This ammo lived in 4 different homes in the interval but was always in a controlled environment.</p></blockquote><p></p>
[QUOTE="Rardoin, post: 2074481, member: 114954"] As most posts have noted, you will likely have some charge variation in new vs fired brass for a given velocity. But, it will likely be close. In example I developed a fireforming load for 7 Sherman Short mag/190gr A-tip that was precise enough at 1000yds to win some very competitive F-class matches...shooting High Master scores and setting a range record. My fully formed load charge weight was .2gr different. That's all. This is blowing the shoulder forward from 30 to 40deg and taking 80% or so of taper out of the body in the process of fire forming; that is much more case capacity change than you will experience by a long shot. I think you will find a load quite easily that is very close to virgin brass assuming the neck were expanded in the same degree when prepping. As far as loading in advance....there a lot of talk of 'cold welding' of the bullet to the neck. If you ammunition is kept in an environment that has humidity control and reasonable temp control you can load it months in advance. The U.S. F-class National teams that compete in the world championships load many months in advance in order to have ammunition shipped out to the host country and cleared through customs well in advance of the matches. I have loaded up .270 ammo for a caribou hunt that sat in a pack in the back of a closet in my home for 12 years. I found it, tested it at 100yds and it shot the same as it initially did. My father has a .338 WM that was his father's. He also had the original box of 200gr ammo that was purchased with the rifle that was used once on a moose hunt in the Yukon in the late 1950's. About 4 years ago he shot a 3 shot group at 100yds that was very close to .75" using that ammunition. This ammo lived in 4 different homes in the interval but was always in a controlled environment. [/QUOTE]
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Does new brass shoot differently than fire-formed brass?
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