The Sellier & Bellot .243 Win NSR Nosler Partition 100 Grain Ammunition is factory-loaded centrefire rifle ammunition engineered for medium to large game hunting. Built with a dual-core Nosler Partition projectile, it provides controlled expansion on initial impact while the integral partition wall locks the rear core to ensure deep penetration through bone and muscle. From a standard 600 mm test barrel, this cartridge produces a muzzle velocity of 865 m/s (2,838 fps) and 2,432 Joules of muzzle energy, loaded into reloadable brass cases fitted with non-corrosive Large Rifle Boxer primers.

Key Features

• Nosler Partition Bullet: Utilises an internal lead-alloy partition that mechanically locks the rear core, allowing the projectile to retain greater than two-thirds (>66%) of its total weight during penetration.
• Controlled Terminal Performance: Features a thin forward jacket to initiate immediate mushrooming in soft tissue, backed by a tapered profile that regulates expansion across dense bone.
• Downrange Energy Retention: Maintains 1,971 Joules at 100 metres, 1,581 Joules at 200 metres, and 1,255 Joules at 300 metres with an aerodynamic G1 ballistic coefficient of 0.358.
• Reloadable Components: Assembled in factory brass casings with an overall cartridge length of 67.50 mm (2.657 inches) for reliable cycling in standard short-action centrefire magazines.

Specifications

• Calibre: .243 Winchester
• Bullet Weight: 100 grains (6.50 grams)
• Bullet Type: Nosler Partition (S&B NSR)
• Muzzle Velocity: 865 m/s (~2,838 fps)
• Muzzle Energy: 2,432 Joules (~1,794 ft-lb)
• Ballistic Coefficient: G1: 0.358 / G7: 0.179
• Sectional Density: 0.242 lb/in²
• Overall Length (OAL): 67.50 mm
• Total Cartridge Weight: 20.8 grams
• Case Type: Reloadable Boxer-primed brass
• Packaging: 20 rounds per box

Who is the Sellier & Bellot 243 Win 100 Grain Nosler Partition Ammo for?

• Medium to large deer hunters — Requires a heavy-for-calibre 100-grain projectile that delivers 865 m/s at the muzzle and maintains structural integrity on quartering shots against species like fallow, red, and chital deer without the premature fragmentation typical of standard cup-and-core centrefire hunting ammunition.
• Feral pest hunters — Needs the deep penetration supported by a 0.242 lb/in² sectional density and an overall cartridge length of 67.50 mm to reliably defeat the thick gristle shields and shoulder bones of heavy-bodied feral hogs using a .243 Win rifle.

Less suitable for: Long-range shots past 250 to 300 metres where retained energy drops to 1,255 Joules (requiring larger-calibre rifles such as .270 Win or .308 Win for medium deer), or for rifles with slow 1:12" to 1:14" barrel twists that fail to stabilise a 100-grain bullet (which perform better with lighter 70 to 85-grain projectiles).