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I figure that I am about to link you to more information on ballistics than you ever wanted to know, But if you read it all you will have your answer and more. http://www.frfrogspad.com/ballisti.htm

You could just skip to the end labeled " terminal ballistics" but you would miss alot.

Basically the little hole doesn't do that much, but it does help some.. the jacket thickness is more important to expansion and the jacket will have designed in weak spots to guide expansion. The hole in the bullet has more to do with where the center of gravity of the bullet is and having the CG more to the rear is a good thing for accuracy... also the hole makes it easier to have a more uniform concentric distribution of weight so you have less wobble when the bullet spins.... the shape of the bullet is important to it's ballistic coeffcient.. the pointy'er the better the faster you go.. so large meplats on pistol bulet are not as bad, as pistol bullets are slower than rifle bullets but on fast bullets large meplats cause it to slow down faster than necesary. The "hollow point" need not be open or visible .303 Brits MkVII bullets and military issue 5.54 x39 AK74 type bullets both have a holow space or a spaced filled with some light soft material like wood or aluminum in the tip to move center of gravity back towards the rear but are not designed to expend necesarily. But the long pointy nose or ogive aids the bullet in going faster longer.. anyway just read the article then you will be wise beyond your years.
 
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