Weatherby Select Plus ammunition in 25 WBY RPM pairs Weatherby's newest high-velocity cartridge with the precision-engineered Hammer Custom (HBC) projectile - a 107 Gr CNC-turned monolithic copper-blend solid hollow point built for serious big-game hunters demanding maximum long-range performance. Launching at 3 350 fps from a 24" barrel with 2 666 ft-lbs of muzzle energy this load is among the flattest-shooting factory 25-caliber offerings commercially available.Weatherby Select Plus 25 WBY RPM 107 Gr Hammer Custom20 rounds per box; 10 boxes per case (200 rounds)Bullet Type: Hammer Custom HBC - monolithic solid hollow point (MHP) lead-freeMuzzle Velocity: 3 350 fps (24" barrel)Muzzle Energy: 2 666 ft-lbsBallistic Coefficient: G1 0.510Brass casing - Boxer-primed reloadable non-corrosiveLead-free; compliant with lead-free hunting regulationsCountry of Origin: United StatesThe Hammer Custom projectile is CNC-turned to exacting tolerances with each bullet individually weighed and micrometer-measured for consistency. On impact the front petals shed immediately while the remaining shank retains mass and continues with a blunt nose profile - delivering an effective controlled wound channel on big game. With a G1 BC of 0.510 this 107 Gr load takes full advantage of the 25 WBY RPM's fast 1:7.5" twist rate enabling heavier high-BC bullets not previously viable in factory 25-caliber rifles. Whether hunting open-country mule deer pronghorn or similar big game at extended range this load delivers the velocity energy retention and terminal performance that Weatherby's premium Select Plus line is built around.