Hornady SST 7mm 139 Grain InterLock Polymer Tip Spitzer Boat Tail Bullets - Box of 100

The Hornady SST 7mm 139 grain rifle bullets deliver the combination of speed, accuracy, and terminal performance that serious handloaders demand. Whether you're working up a load for whitetail, mule deer, antelope, or larger game like moose and elk, these polymer-tipped projectiles are engineered to shoot flat, group tight, and expand reliably across a wide velocity range. Each box contains 100 bullets—enough for a meaningful session at the reloader's bench or a full season in the field.

At the heart of the SST design is the polymer tip, which serves double duty: it boosts the ballistic coefficient for flatter trajectories and less wind drift, then initiates controlled expansion on impact. The secant ogive boat-tail profile further enhances downrange velocity and energy retention, so your shots stay effective at distance. The InterLock ring is the feature that sets Hornady apart here—it mechanically locks the jacket to the core during expansion, preventing jacket/core separation and preserving bullet mass for deep, devastating wound channels. The cannelure supports consistent crimping and works in concert with the InterLock system to manage expansion rate.

These bullets suit hunters and reloaders who want factory-quality performance in a component form, allowing you to tailor velocity, powder charge, and accuracy to your specific rifle. The 139-grain weight in 7mm is a proven sweet spot for medium to large game, balancing velocity potential with sectional density. If you're building hunting loads from scratch or refining a proven recipe, SST bullets have earned their reputation for reliable field performance.

Key Features

• Polymer tip increases ballistic coefficient and initiates controlled expansion
• InterLock ring locks jacket and core together to prevent separation and maintain mass
• Secant ogive boat-tail profile optimizes velocity and downrange energy
• Cannelure ensures accurate, consistent crimping
• Designed for reliable expansion across a range of velocities
• Box of 100 bullets

Specifications

Frequently Asked Questions

What game is the 7mm 139-grain SST suitable for?

The SST is designed for medium to large North American game including whitetail, mule deer, antelope, moose, and elk, as well as similar-sized African plains game. Its sectional density and expansion characteristics work across a broad range of hunting scenarios.

How does the InterLock ring improve terminal performance?

The InterLock mechanically bonds the jacket to the core. During expansion, this connection prevents the jacket and core from separating, so the bullet retains more of its original mass and momentum. This results in deeper penetration and larger, more consistent wound channels.

Can I use these bullets in my reloading press without special equipment?

The SST includes a cannelure that supports standard crimping techniques, making them compatible with typical reloading setups. However, always follow safe reloading practices and consult load data specific to your rifle and powder combination.

What does the polymer tip do?

The polymer tip serves two functions: it raises the ballistic coefficient for improved aerodynamics and downrange performance, and upon impact it initiates controlled expansion for reliable terminal effect.