- Hornady InterLock BTSP — traditional cup-and-core hunting bullet for 7mm hand-loaders
- Calibre: 7mm / .284" diameter, 139 grain boat-tail soft point
- InterLock ring locks core and jacket together during expansion to retain mass
- Secant ogive profile and boat-tail base reduce drag for flatter trajectories
- Tapered jacket controls expansion reliably across a wide range of impact velocities
- Cannelure provides a consistent, accurate crimp point during the loading process
- Component bullets for hand-loading — not factory-loaded ammunition
The Hornady InterLock BTSP (Boat-Tail Soft Point) in 7mm .284" at 139 grains is a versatile cup-and-core hunting bullet built around Hornady's secant ogive design — one of the most ballistically efficient profiles in traditional bullet construction. The exposed lead tip initiates controlled expansion on impact, while the boat-tail base reduces drag for a flatter trajectory and better long-range performance. The InterLock ring is the defining feature: a raised ring inside the gilding-metal jacket that embeds into the lead core, locking the two together during expansion to retain mass and deliver deep, consistent penetration. A tapered jacket with precisely controlled wall thickness ensures reliable expansion across a broad velocity range, and the cannelure provides a firm crimp point for reloaders. At 139 grains, this bullet strikes a useful balance between velocity retention and sectional density for 7mm deer and woodland game, making it a sound choice for hand-loaders working up loads for roe, fallow or red deer in 7mm Mauser, 7×64 or 7mm Rem Mag.
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