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Understanding Jumping and Jamming a Bullet
Regarding reloading techniques, jamming or jumping a bullet relates to the seating depth of the bullet during loading and its distance from the rifling of your barrel when chambered. Seating depths are commonly referred to as either jump or jam distances. Jump relates to the distance from the lands of the rifling (the raised ridges of metal inside the rifle barrel),
while jam refers to the distance into the rifling that you push the bullet when you chamber a round by closing your bolt.
Reference to Ammerman Arms’ 6mm 68Gr HPBT and 6mm 68Gr HPFB:
Example, .035 Freeboard may need to be jumped or jammed starting at .005
Learn how the swaging process creates more accurate ammunition. Contact our team at Ammerman Arms to shop our selection of hand-swaged bullets.
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Ammerman Arms proudly produces and provides a wide range of hand-swaged bullets and loaded ammunition perfect for hunting prairie dogs and other varmints.
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