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Is your question regarding HBWC or DEWC?
They cut very neat holes in the targets. The long contact length with the rifling tends to provide better accuracy than bullets with less contact.
The HBWC seal the bore very effectively and are renown for their accuracy. Don't try and push them too fast since you can blow the skirt off. These are swaged and can accommodate a wide range of groove diameters without leading.
DEWC also cut nice holes in targets and provide very good accuracy. Can be driven to higher velocities than HBWC. You can also get these in a wider variety of BHN's if you buy commercially cast.
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