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Rifles, Reloading, Optics, Equipment
Reloading
300 PRC Hammer 199 Retumbo/N565
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<blockquote data-quote="RockyMtnMT" data-source="post: 2403307" data-attributes="member: 7999"><p>I think you might be too close to the lands. When I can reach the lands I start at 20 thou off. Closer than that and it seems you can see some pressure spikes. The drive band design is for reducing the amount of contact in the bore but it also reduces contact in the case neck. Sometimes the primer ignition will jump the bullet before the powder gets going pushing the bullet in the lands when the powder ignites can cause erratic pressure. A little more jump and possibly a little more neck tension.</p><p></p><p>You are correct. They generally are not sensitive to seating depth but I think you will be better off 20 thou off so off. They certainly don't mind jumping.</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 2403307, member: 7999"] I think you might be too close to the lands. When I can reach the lands I start at 20 thou off. Closer than that and it seems you can see some pressure spikes. The drive band design is for reducing the amount of contact in the bore but it also reduces contact in the case neck. Sometimes the primer ignition will jump the bullet before the powder gets going pushing the bullet in the lands when the powder ignites can cause erratic pressure. A little more jump and possibly a little more neck tension. You are correct. They generally are not sensitive to seating depth but I think you will be better off 20 thou off so off. They certainly don't mind jumping. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 PRC Hammer 199 Retumbo/N565
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