I know you can resize 30-30 brass to 32WS, but I am very hesitant to use that brass...as I have a 30-30 as well. When I am able, I want to stick with properly marked 32 brass for my reloads.
One way to avoid trouble is to use two separate head stamps. One for 30-30 and the other for .32SPL. You'll never chamber a .32SPL into your 30-30, but the other way around will send a bullet down the bore like a golf ball through a rain gutter--rattling the whole way. 30-30 brass is a whole lot easier to come by and cheaper. For the exact same brass at twice the price just for a different head stamp, I could never justify the .32SPL brass.