Rimmed cases are usually used in single shots, revolvers, and lever actions. As the Desert Eagle demonstrates they can be used in semi-autos with rotating bolts (44 mag & 357). A few bolt actions use rimmed cartridges. ( 44 Mag Rem 788). The main problem with rimmed cartridges is trying to use them in stacked magazines, though it can be made to work.
What is your application for a rimmed 300W that won't work with a rimless 300W?
Have you considered using a 32-20 Winchester case?
22 grains case capacity. Works well with .308 Bullets