Bullet expansion has a great deal to do with the terminal effects of the bullet on game animals. Depending on the species being hunter, differing degrees of expansion are required. For example: varmints require a very explosive bullet that immediately disrupts, deer sized game need a bullet that will penetrate while at the same time expanding, large/dangerous game often require a bullet that does not expand, as deep penetration is required to reach the vitals.
Bullet expansion is in a reverse relationship with penetration, the more a bullet expands, the larger diameter it becomes and as a result the more resistance it encounters and the faster it slows. There are many ways in which bullet manufacturers try to balance this relationship, Nosler Partition and Swift A-frame have to separate cores, one to expand the other to force penetration.
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