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Originally Posted by Schlepprock
Thanks..whats the difference in jacketed vs non jacketed?..
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Jacketed has a layer of copper on the outside. At the higher pistol velocities it reduces the lead accumulation in the barrel.
It grabs the rifling really well for spinning the bullet.
Lead bullets have a little tin melted with it to make it hard enough to grab the rifling.
So going full circle - they can put “soft” lead inside a copper jacket, and make a soft nose or hollow point that expands well and makes good contact with barrel grooves that spin it for accuracy.
Nowadays they vary the hardness of the lead inside the copper jacket depending on velocity. An example of a no-no would be putting 44 magnum pistol bullets in a 44 magnum rifle. The pistol bullet is designed to expand at pistol velocities so does poorly in a rifle, where it expands excessively at the higher velocity attained through the longer barrel.
It is definitely worth reading about.