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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hot barrel E.S.
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<blockquote data-quote="Topshot" data-source="post: 261759" data-attributes="member: 13285"><p>My main interest in this was in developing a low ES load for my rifle. I started off trying with five shot groups and the last one or two shots always blew the extreeme spread way out. I then began wondering what was causing this to happen. I then worked on ten shot groups to get more positive data.</p><p> </p><p>Some of the thoughts I had were barrel expansion resulting in less resistance to the bullets travel down the barrel and also the temperature of the powder altering its burning rate. I use ADI powder and didn't think temperature would play such a big part.</p><p> </p><p>I have now developed a long range load based on shots only fired from a cold barrel using 70 grains of AR2209 and a 250 grain Hornady BTHP Match bullet at 2724 fps. ES is in the low teens. Accuracy is very good.</p></blockquote><p></p>
[QUOTE="Topshot, post: 261759, member: 13285"] My main interest in this was in developing a low ES load for my rifle. I started off trying with five shot groups and the last one or two shots always blew the extreeme spread way out. I then began wondering what was causing this to happen. I then worked on ten shot groups to get more positive data. Some of the thoughts I had were barrel expansion resulting in less resistance to the bullets travel down the barrel and also the temperature of the powder altering its burning rate. I use ADI powder and didn't think temperature would play such a big part. I have now developed a long range load based on shots only fired from a cold barrel using 70 grains of AR2209 and a 250 grain Hornady BTHP Match bullet at 2724 fps. ES is in the low teens. Accuracy is very good. [/QUOTE]
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Hot barrel E.S.
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