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<blockquote data-quote="Alex Wheeler" data-source="post: 1471758" data-attributes="member: 101859"><p>You just cant be sure of the true impact spot when shooting rocks. It fools you into thinking your better than you are. The dust kicks up and it looks right there. I think if you try hanging a target you will see that when your transition over to the target the group will be much larger and farther from poa than you would have thought from watching the rock. Just give it a try. From my own experience, even knowing that rock hits fool you, Im still surprised when transitioning to paper how different the groups are than what Id expect from sighting on rocks.</p><p>Barrel harmonics are why a load may not hold up at distance. Depending on the angle of the barrel during bullet exit time you may help lr grouping or hurt it. Its called positive compensation, google search if your interested in it. But if you have ever tuned up a good load and experienced terrible vertical at long range even though ES was good, thats why (neg compensation). Or on the other hand tuned up a load with bad ES but still had good long range groups (*** compensation).</p></blockquote><p></p>
[QUOTE="Alex Wheeler, post: 1471758, member: 101859"] You just cant be sure of the true impact spot when shooting rocks. It fools you into thinking your better than you are. The dust kicks up and it looks right there. I think if you try hanging a target you will see that when your transition over to the target the group will be much larger and farther from poa than you would have thought from watching the rock. Just give it a try. From my own experience, even knowing that rock hits fool you, Im still surprised when transitioning to paper how different the groups are than what Id expect from sighting on rocks. Barrel harmonics are why a load may not hold up at distance. Depending on the angle of the barrel during bullet exit time you may help lr grouping or hurt it. Its called positive compensation, google search if your interested in it. But if you have ever tuned up a good load and experienced terrible vertical at long range even though ES was good, thats why (neg compensation). Or on the other hand tuned up a load with bad ES but still had good long range groups (*** compensation). [/QUOTE]
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