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Rifles, Reloading, Optics, Equipment
Reloading
New to 243 AI Question
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<blockquote data-quote="Will D" data-source="post: 1483087" data-attributes="member: 98378"><p>I'm stuck with the Sierra 85 gr HPBT because I have a lifetime supply and my barrel has a 1:10 twist. I started with 45 gr IMR 4350 in fire formed Lapua cases and bullets 1/8" into the lands. Working up a half grain at a time extreme spreads and s/ds decreased until 47.0 grains produced 3,500 fps with 8.2 fps s/d. At that point the bolt of the Sako 579 was a bit sticky on opening, but primers and cases showed no signs of pressure. I have no plans to push the velocity further and may back off a half grain or so to extend barrel life.</p></blockquote><p></p>
[QUOTE="Will D, post: 1483087, member: 98378"] I'm stuck with the Sierra 85 gr HPBT because I have a lifetime supply and my barrel has a 1:10 twist. I started with 45 gr IMR 4350 in fire formed Lapua cases and bullets 1/8" into the lands. Working up a half grain at a time extreme spreads and s/ds decreased until 47.0 grains produced 3,500 fps with 8.2 fps s/d. At that point the bolt of the Sako 579 was a bit sticky on opening, but primers and cases showed no signs of pressure. I have no plans to push the velocity further and may back off a half grain or so to extend barrel life. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
New to 243 AI Question
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