To be honest Deaf Smith, those .30-30 rounds aren't anything I can use, not having a .30-30.
I no longer have a working chronograph, so I don't know what velocities I've been running other coated GC bullets at.
There is plenty of load data for many GC cast bullets at velocities over 2200 fps (generally
< 2350 fps for .30-30), so I'd say run them and see what results you get.
Most of my shooting is with reduced loads. Many bullets that I cast (Lyman 266469) are run w/o GCs or are plain-base bullets (like the Lyman 311410). 6 to 12 grains of pistol powder never gives me much grief. Makes for easy-shooting, economical plinking fodder.