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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
338 Lapua Improved
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<blockquote data-quote="Willys" data-source="post: 2616299" data-attributes="member: 115262"><p>Throat length and any borerider throat matters a lot. With 300 gr Im using 105 gr N570 or 112 gr of newer slow RL33 which is 4 gr slower than prior lot. 2970 n570, 3050 rl33. I could shoot 94 retumbo in Std Lapua. You may get up to 104 depending on throat. Id start 97 and go up a grain at a time and stop at 2970-3000 fps or any sign of pressure. </p><p></p><p>I found n570 more consistent. Getting 7 shot groups with 2" of vertical at 1000. Mild load retumbo may be the same if not pushed.</p></blockquote><p></p>
[QUOTE="Willys, post: 2616299, member: 115262"] Throat length and any borerider throat matters a lot. With 300 gr Im using 105 gr N570 or 112 gr of newer slow RL33 which is 4 gr slower than prior lot. 2970 n570, 3050 rl33. I could shoot 94 retumbo in Std Lapua. You may get up to 104 depending on throat. Id start 97 and go up a grain at a time and stop at 2970-3000 fps or any sign of pressure. I found n570 more consistent. Getting 7 shot groups with 2” of vertical at 1000. Mild load retumbo may be the same if not pushed. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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338 Lapua Improved
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