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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Twist vs Bullet Weight Question
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<blockquote data-quote="Calvin45" data-source="post: 2938078" data-attributes="member: 109862"><p>For the OP [USER=126670]@Small Lady[/USER] Here's some pictures to illustrate what we've been saying. </p><p></p><p>Here is a 225 eld m and a 200 SMK (.30 cal) beside each other, bases flush against a butter knife. The 225 is heavier obviously BUT as you can see, it is longer too. </p><p></p><p>[ATTACH=full]507343[/ATTACH]</p><p></p><p>HOWEVER….hornady lists the minimum stability twist as 1:10, Sierra as 1:9. </p><p></p><p>Here, I have them beside each other BUT with the transition points from shank to ogive being parallel (as crudely determined by etching a little ring into them with a resized .300 win mag case mouth. As you can see, the ogive on the 200 SMK is actually longer than the 225 eldm. </p><p></p><p>[ATTACH=full]507344[/ATTACH]</p><p></p><p>Finally, side by side with boat tail/shank junctions parallel. Again, the smk is just a more "severe" and less forgiving bullet: it's boat tail is notably longer than the eld too! </p><p></p><p>[ATTACH=full]507345[/ATTACH]</p><p></p><p>These things are why it actually does take more twist to stabilize this smk: longer ogive, longer boat tail, waaaaaaay shorter bearing surface, and definitely more aggressively rear heavy all means it's less stable at a given twist .</p></blockquote><p></p>
[QUOTE="Calvin45, post: 2938078, member: 109862"] For the OP [USER=126670]@Small Lady[/USER] Here’s some pictures to illustrate what we’ve been saying. Here is a 225 eld m and a 200 SMK (.30 cal) beside each other, bases flush against a butter knife. The 225 is heavier obviously BUT as you can see, it is longer too. [ATTACH type="full"]507343[/ATTACH] HOWEVER….hornady lists the minimum stability twist as 1:10, Sierra as 1:9. Here, I have them beside each other BUT with the transition points from shank to ogive being parallel (as crudely determined by etching a little ring into them with a resized .300 win mag case mouth. As you can see, the ogive on the 200 SMK is actually longer than the 225 eldm. [ATTACH type="full"]507344[/ATTACH] Finally, side by side with boat tail/shank junctions parallel. Again, the smk is just a more “severe” and less forgiving bullet: it’s boat tail is notably longer than the eld too! [ATTACH type="full"]507345[/ATTACH] These things are why it actually does take more twist to stabilize this smk: longer ogive, longer boat tail, waaaaaaay shorter bearing surface, and definitely more aggressively rear heavy all means it’s less stable at a given twist . [/QUOTE]
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Twist vs Bullet Weight Question
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