Remington Core-Lokt 270win.

Since 1939, more hunters have relied on Remington Core-Lokt® than any other big game ammunition, and rightly so. It's filled more tags on more continents than any other load. Core-Lokt® is the original controlled expansion bullet. Its time-proven performance has made it hunting's first choice for over 75 years. The tapered copper jacket is locked to a solid lead core delivering massive 2X expansion, weight retention and consistent on-game results.