excuse my ingnorance due to being new to reloading but I have the dies I need for a .300 Savage made by Hornady But the press I was given is an older RCBS Are dies intercompatible between different press manufacturers
Yes, dies from different manufacturers are a standard 7/8x14 except for really large case calibers like 50 BMG. All .300 Savage dies I've seen are that size and so is the RCBS press (I have an old Reloder Special 2, great single stage press).
As far as I know, the only proprietary dies available belong to the Dillon Square Deal B press, the rest, except for the already mentioned 50 BMG, should be a standard size.