7 62x54R Cartridge 3D model is available on CGTrader for $25. Original author: Plutonius3d. Specs: 11958 polys, 5985 verts.
OBJ (OBJ, filesize: 153 KB), FBX (Autodesk FBX, filesize: 1.25 MB), UNITYPACKAGE (Unity 3D, filesize: 686 KB), 3DS (3D Studio, filesize: 151 KB), MAX (Autodesk 3ds Max, filesize: 636 KB)