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Bullet jump vs pressure?

4164 Views 20 Replies 7 Participants Last post by  jake2far
I seem to find conflicting opinions re bullet jump and pressure. Some say touching the lands can cause 80,000 psi, some say too much jump will raise pressure 7,000. Other say different bullets need different jumps. Or seating a bullet an extra .030 into the case causes pressure to rise.

41.5 gr IMR 4895 168s is giving me flat primers and short case life, lots of stretching. Jump is about my last variable.

Whaddya think?
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Read this, it might help.

It is possible that your dwell time is short, if it is the extraction happens while the case pressure is high.
This link explains it.

Another possible solution/problem, is your chamber clean and smooth, brass can stick in the chamber, if it does it takes more force to extract.

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