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Rifles, Reloading, Optics, Equipment
Reloading
Reloading
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<blockquote data-quote="Alaska2006" data-source="post: 1239963" data-attributes="member: 92741"><p>Jump is how far the bullet is way from the lands. think of it as giving the bullet a running start before engaging the rifling lands. </p><p>as a rule you will see less pressure when seated off the lands. That said you need to be careful in seating the bullet too deep in the case. The deeper in the case the smaller the combustion chamber so to speak and this too can increase pressure. Another issue with seating too deep, if you go too far you run the risk of the case neck not holding the bullet correctly and the bullet can push inside the case when trying to chamber a round or in some instances simply recoil can push the bullet the case if all things are not correct. </p><p>Jump/jam is critical to great accuracy and every rifle is different. Start out by finding here your lands by using a modified case and COAL gauge. </p><p></p><p>I'm sure I haven't explained it in the best way but hope this offers and idea of jump and jam</p></blockquote><p></p>
[QUOTE="Alaska2006, post: 1239963, member: 92741"] Jump is how far the bullet is way from the lands. think of it as giving the bullet a running start before engaging the rifling lands. as a rule you will see less pressure when seated off the lands. That said you need to be careful in seating the bullet too deep in the case. The deeper in the case the smaller the combustion chamber so to speak and this too can increase pressure. Another issue with seating too deep, if you go too far you run the risk of the case neck not holding the bullet correctly and the bullet can push inside the case when trying to chamber a round or in some instances simply recoil can push the bullet the case if all things are not correct. Jump/jam is critical to great accuracy and every rifle is different. Start out by finding here your lands by using a modified case and COAL gauge. I'm sure I haven't explained it in the best way but hope this offers and idea of jump and jam [/QUOTE]
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Reloading
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