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Which 30 remington? I checked the 6th edition of the Hornady Reloading manual, they list a 300 Reminton Short Action Ultra Mag, and a 300 Remington ultra mag. They are both based on a 404 Jeffreys Case.
It was Remington's answer to the 30-30 win, similar ballistics in a rimless case, buddy has a nice pump chambered in it built pre-war, ammo is occasionally available if enough demand is there, Rem pumps out a batch, or you can build your own.
25,30,&32 all use the same case 35 is different. 30 Rem can be made on a lathe from 30-30 or 225 win and then formed in your dies. 35 can be lathed from 303brit or 30-40 krag and then formed.
Rich