title: vim limited line memory
body: <p>im trying to copy 300 lines from one file to another,
  in source file i type "300yy", it says it has yanked 300 lines.</p>
  
  <p>go to destination file and press p,
  it pastes, but only the first 50 lines.</p>
  
  <p>any idea why it isn't pasting the 300?</p>