Best Nosler Custom Brass 375 H&H Magnum. Nosler Custom Brass was developed to complement their line of custom bullets. Each lot is weight-sorted to provide consistent measurements and capacities for accurate loads and feature a Nosler head stamp. Before shipment, Nosler chamfers and deburrs the case mouths and deburrs the flash hole. Fully prepped and ready to load upon receipt. Each piece of brass offers a consisten in trimmed length and neck wall thickness. This brass is new and unprimed. This is not loaded ammunition.