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Normally it's an indication that the rifling twist is to slow to stabilize a heavy bullet. Another condition is a crown that is not symetrical. Often caused by cleaning from the muzzle end. Also people often have the bad habit of carrying a rifle muzzle down on a vehicle and stones or sand on the floor will destroy the crown. Gas escaping on one side of the bullet first will throw the back of the bullet into a yawh that it cannot recover from. A good gunsmith can correct that by lapping the crown with a brass stud and 800 grit garnet. Do not lao your bore until you run a cast slug first. It may already be worn oversize.

[QUOTE="PrairieGhost, post: 232128, member: 704"] Normally it's an indication that the rifling twist is to slow to stabilize a heavy bullet. Another condition is a crown that is not symetrical. Often caused by cleaning from the muzzle end. Also people often have the bad habit of carrying a rifle muzzle down on a vehicle and stones or sand on the floor will destroy the crown. Gas escaping on one side of the bullet first will throw the back of the bullet into a yawh that it cannot recover from. A good gunsmith can correct that by lapping the crown with a brass stud and 800 grit garnet. Do not lao your bore until you run a cast slug first. It may already be worn oversize. [/QUOTE]

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