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Hunting
Long Range Hunting & Shooting
FINALLY Got to Shoot My 338 Ultra Mag.
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<blockquote data-quote="liltank" data-source="post: 383638" data-attributes="member: 13275"><p>When it comes to selecting a bullet it pays to play with load development. Now you see that it doesn't group by moving the bullet in and out, pick a length.... like .010" off the lands and do a ladder test. Put loads together in .5grn increments and starting low and working up to max. This should show you accuracy nodes as you shoot. One load that works for one guy generally never works for another. With the RUM, I would start at 90.0grns of H1000 and work up to your max. You may not get max velocity, but you may find your bullet settles down and becomes accurate. If that doesn't prove to work then it's time to move on. I have found that ladder testing finds accuracy. You may even want to drop as low as 88.0grns. I would still try some touching the lands also. You could do this in your ladder test.</p><p></p><p>Some vertical stringing can be caused by large jumps in velocity. You generally don't see until you really stretch it out, but that is the case most often. If you have access to a chronograph, it would pay to use it and see what kind of velocity spreads you are getting. You may need to change powder and try Retumbo, or something in that lines. H4831sc and IMR 7828ssc or regular 7828 may be something to try as well. Just some idea's. </p><p></p><p>Of the three targets, .005 looks the best. You may see a tighter group when you touch the lands. It looks like the farther from the lands you move the bigger the group. Touching the lands may be the ticket.</p><p></p><p>Tank</p></blockquote><p></p>
[QUOTE="liltank, post: 383638, member: 13275"] When it comes to selecting a bullet it pays to play with load development. Now you see that it doesn't group by moving the bullet in and out, pick a length.... like .010" off the lands and do a ladder test. Put loads together in .5grn increments and starting low and working up to max. This should show you accuracy nodes as you shoot. One load that works for one guy generally never works for another. With the RUM, I would start at 90.0grns of H1000 and work up to your max. You may not get max velocity, but you may find your bullet settles down and becomes accurate. If that doesn't prove to work then it's time to move on. I have found that ladder testing finds accuracy. You may even want to drop as low as 88.0grns. I would still try some touching the lands also. You could do this in your ladder test. Some vertical stringing can be caused by large jumps in velocity. You generally don't see until you really stretch it out, but that is the case most often. If you have access to a chronograph, it would pay to use it and see what kind of velocity spreads you are getting. You may need to change powder and try Retumbo, or something in that lines. H4831sc and IMR 7828ssc or regular 7828 may be something to try as well. Just some idea's. Of the three targets, .005 looks the best. You may see a tighter group when you touch the lands. It looks like the farther from the lands you move the bigger the group. Touching the lands may be the ticket. Tank [/QUOTE]
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FINALLY Got to Shoot My 338 Ultra Mag.
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