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Long Range Hunting & Shooting
Goofy question 300gr berger/spin drift
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<blockquote data-quote="bushido2222" data-source="post: 599676" data-attributes="member: 12896"><p>If you just mounted a new untested scope you may find that your erector tube does not move in a perfectly vertical line when you dial in your dope. You can test this at 100 yards by hanging a weighted string in front of a 4' tall piece of butcher paper. Place a dot at the bottom and to the side of the string and shoot it. Dial your scope up to your 400yd dope and shoot again ( approximate 25"). Dial up your 500yd dope and fire again (approximate 46"). All your shots should measure the same distance away from the string. If they start to walk away from the string either your scope is canted or the erector tube doesn't track straight up and down. Either way it is an easy fix to rotate your scope until the above test tracks perfect. I actually know some guys that rotate their scopes to the left to compensate for spindrift so their windage drop charts are neutral at longer ranges as sort of a compromise. If your not running a level on your rifle you need to. Without a level you can cant the rifle enough to throw shots 8-10 at 800yds. Just a few things to mull over. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> I show my 338 ultra as having 1.6" due to coriolis with the figures you stated. I also show 3.4" for spindrift at the same range.</p></blockquote><p></p>
[QUOTE="bushido2222, post: 599676, member: 12896"] If you just mounted a new untested scope you may find that your erector tube does not move in a perfectly vertical line when you dial in your dope. You can test this at 100 yards by hanging a weighted string in front of a 4' tall piece of butcher paper. Place a dot at the bottom and to the side of the string and shoot it. Dial your scope up to your 400yd dope and shoot again ( approximate 25"). Dial up your 500yd dope and fire again (approximate 46"). All your shots should measure the same distance away from the string. If they start to walk away from the string either your scope is canted or the erector tube doesn't track straight up and down. Either way it is an easy fix to rotate your scope until the above test tracks perfect. I actually know some guys that rotate their scopes to the left to compensate for spindrift so their windage drop charts are neutral at longer ranges as sort of a compromise. If your not running a level on your rifle you need to. Without a level you can cant the rifle enough to throw shots 8-10 at 800yds. Just a few things to mull over. :) I show my 338 ultra as having 1.6" due to coriolis with the figures you stated. I also show 3.4" for spindrift at the same range. [/QUOTE]
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Goofy question 300gr berger/spin drift
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