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Old October 26, 2013, 05:44 PM   #4
Nick_C_S
Senior Member
 
Join Date: March 21, 2013
Location: Idaho
Posts: 5,510
Yep. Above is correct.

The base of the bullet "obturates" - uhh, it expands up, sealing the base of the bullet against the barrel lands n grooves. It basically maximizes velocity and accuracy, while minimizing barrel leading (if applicable)

It does, however, have a drawback. When loaded too hot, they will over-obturate - distort, if you will - potentially causing barrel damage and other issues. The least of which, being a very inaccurate round.
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