This is directly from Hornady
The key to the LEVERevolution ammunition, two years in development, is a new Evolution spitzer (pointed) bullet with a red elastomer Flex Tip. This tip flattens enough to cushion the primer of the cartridge in front of it in the magazine during the acceleration of recoil, yet returns to its original shape instantly thereafter. The Flex Tip has been tested at temperatures from -40 to +130 degrees F, and also passed 15' drop tests in full magazine tubes and many rounds of proof loads. The Flex Tip eliminates the possibility of a magazine chain-fire, the bugaboo that has prevented the use of pointed bullets in rifles with tubular magazines.