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Art Eatman Remember that skin is flexible. An entry hole will partially close. The exit hole is larger due to bullet expansion and/or "shrapnel". The skin around an exit wound is torn, rather than merely punctured.
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A big plus for semi wad-cutter bullets in the slow-heavy catagory is that they punch a full caliber hole upon entry. An example is when a paper target is placed against cardboard or other flexible backing. A bullet without the sharp corners will leave a less than caliber hole with the paper torn inward, while a SWC bullet will cut a full caliber hole. The same effect is evident on game. The amount of blood that pours from the entry wound of a SWC is significant higher, while the "flaps" from a rounded profile bullet tend to close / plug the wound, AOTBE.