I had a Rossi .44 Magnum we shot a lot with similiar loads, a 200gr. RNFP bullet with 8.5gr. of Universal Clays. We called 'em "popcorn loads", they popped and tossed bullets at roughly .44WCF speeds, 1200fps. Scarcely any recoil, and they shot pretty well. I killed a few rabbits with it, amongst other things. I even lobbed a few at prairie dogs, just for fun.
I'm sure that the .30/30 can be loaded similiarly, but it's easier with the .44 Magnums, since you can use carbide dies.
Been thinking about doing similar loads for my .375 Winchester.
Anyone know where to get the old GMDR.com data? The web site appears to be down. Never mind. couldn't get to the site this morning but it comes up now.
