The Hornady InterLock 6mm .243 100 gr BTSP (Boat Tail Spire Point) is an unprimed component projectile engineered for handloading medium game hunting ammunition. Featuring a 0.243-inch bullet diameter and weighing 100 grains (approximately 6.48 grams), this projectile pairs an aerodynamic boat tail spire point profile with Hornady's InterLock mechanism. Designed for handloaders working with 6mm cartridges such as .243 Winchester, 6mm Creedmoor, and 6mm Remington, it delivers a balance of flat trajectory and controlled expansion across medium-sized game classes ranging from 23 kg to 136 kg (50 to 300 lbs).

• InterLock Ring: Uses a mechanical raised ring inside the jacket that embeds into the one-piece lead-alloy core during swaging, preventing core-jacket separation upon impact to maximise weight retention.
• Aerodynamic Boat Tail Profile: Combines a secant ogive and boat tail base to achieve a 0.405 G1 ballistic coefficient, reducing aerodynamic drag and flattening external trajectories.
• Controlled Expansion: Incorporates inner jacket grooves and a tapered copper jacket engineered to initiate reliable, uniform expansion across standard hunting velocities.
• Integrated Cannelure: Features a dedicated crimping cannelure to ensure accurate, secure bullet seating and reliable feeding in bolt-action and semi-automatic rifles.
• Sectional Density: Carries a sectional density of 0.242, providing deep penetration on medium game vitals.

Specifications

• Calibre / Bullet Diameter: 6mm / .243 in (0.243″)
• Bullet Weight: 100 grains (approx. 6.48 g)
• Bullet Profile: Boat Tail Spire Point (BTSP) with cannelure
• Ballistic Coefficient (G1): 0.405
• Sectional Density: 0.242
• Core Construction: One-piece lead-alloy core
• Jacket Material: Tapered copper jacket
• Target Game Weight Range: 23 kg to 136 kg (50 to 300 lbs)
• Quantity: 100 projectiles per box

Who is the Hornady .243 6mm Cal 100 Grain Btsp Interlock Bullets 100 Pack for?

• Medium game cartridge handloaders — requires the 100-grain weight and 0.405 G1 ballistic coefficient of this 6mm reloading component bullet to handload .243 Winchester or 6mm Creedmoor cartridges that maintain aerodynamic stability, low drag, and flat trajectory.
• Feral game and deer hunters — relies on the 0.243-inch diameter InterLock projectile to deliver controlled expansion and weight retention against feral goats, pigs, fallow deer, and wild dogs weighing between 23 kg and 136 kg.

Less suitable for: Thin-skinned vermin like rabbits and foxes requiring rapid fragmentation (where lightweight, thin-jacketed 58–75 gr varmint projectiles are more effective), or heavy game exceeding 136 kg (300 lbs) such as large red stag, sambar, or scrub bulls, which require larger-calibre (.270, .308, 9.3mm) heavier bonded or monolithic bullets.