Hornady's 10mm Auto 135gr MonoFlex breaks from tradition with its innovative all-copper construction. This isn't your grandfather's lead core bullet - it's a precision-engineered projectile that screams downrange at 1315 fps. The lighter 135-grain weight might raise eyebrows among 10mm traditionalists, but that's exactly what enables this round's blistering velocity while maintaining 518 ft-lbs of energy on target. Think surgical precision rather than brute force.

For hunters facing lead ammunition restrictions, this MonoFlex load opens up new possibilities. The copper construction maintains nearly 100% weight retention through tough hide and bone, while the polymer-filled hollow point ensures reliable expansion without fragmentation. Those hunting deer or similar-sized game will appreciate how this round drops targets cleanly without destroying excessive meat. The controlled expansion characteristics make it equally effective against predators, from coyotes to black bears.

This ammunition truly shines in situations demanding both terminal performance and environmental consciousness. The monolithic copper design means you can hunt confidently in California, parts of Arizona, or any other lead-restricted areas. That same construction provides exceptional barrier penetration for defensive applications, particularly through automotive glass or heavy clothing. While the recoil feels different from traditional heavy-bullet loads, the faster follow-up shots more than make up for any adjustment period. Just be prepared for some surprised looks when range neighbors peek at your copper-only brass.