Well think outside the box. Some I have dreamed up on the 303 case t that I know haven't been done before as the mods are to my specifications.
All have a .257 neck whether 25 cal or 35 cal. All have min body taper and 35 degree shoulder to give max powder capacity and best burn character while maintaining an easy to feed and chamber cartridge.
View attachment 368535
All case capacity ous 60+ grains of powder with bullet seated 1 caliber or less.
We need to do a .375/303 bob we can call it the .375 sabrelope.