Lapua Brass 6MM Creedmoor Srp 100PKLapuas 6mm Creedmoor case is a necked down version of the extremely popular 6. 5mm Creedmoor. It is designed to produce higher velocities, flatter trajectories, and reduced recoil. Customer demand for a 6mm version followed almost immediately after the release of the original Creedmoor case. Aside from the neck dimensions, the Lapua 6mm Creedmoor case shares the same features and characteristics that make Lapua the standard for 6. 5 Creedmoor brass.