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The Berger is designed with a very thick jacket in the nose to aid in delaying expansion and once expansion begins, they fragment very quickly. Obviously, velocity plays a huge role in when expansion begins and how rapid it is but the design of the Berger is to provide initial penetration with minimal expansion and then very violent expansion after that.
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The rate of expansion often changes as the bullet penetrates,but the actual expansion begins the instant the bullet strikes a media with enough resistance to initiate expansion.The thick jacket in the nose of a Berger bullet does not totally delay expansion,rather it controls the rate of expansion.The result is that the bullet initially expands quite slowly,then the rate of expansion increases dramatically as the nose opens up.The bullet may not expand rapidly upon first contact,but it is still expanding.