HSM Ammunition Varmint .243 Winchester 75 Grain Spitzer Brass Cased Rifle Ammo 20 Rounds. 223 Rem. round HSM offers Varmint Blue. The little blue thrill-always ready when you are Varmint Blue is the latest. Specifications for HSM Ammunition Varmint .243 Winchester 75 Grain Spitzer Brass Cased Rifle Ammunition: Manufacturer: HSM Ammunition Caliber: .243 Winchester Number of Rounds: 20 Bullet Type: Spitzer Bullet Weight: 75 grain Cartridge Case Material: Brass Muzzle Velocity: 3300 ft/s Application: Hunting Primer Style: Centerfire What is HSM Ammunition Varmint .243 Winchester 75 Grain Spitzer Brass Cased Rifle Ammunition good for? The manufacturer says that it is good for hunting.HSM Ammunition 2432N: Varmint .243 Winchester 75 Grain Brass Cased Rifle Ammo 20 Rounds