I don't have a .35, but might get my Martini Henry action done up in .35 WCF. I'll watch this thread for advice on cast bullets.
Question; How well do you clean before trying your cast bullets. Often i have read , in NRA cast bullet discussions, that copper fouling and alox lubes are incompatible. The advice is to clean VERY thoroughly when changing ammo.
I use cast bullets as small game loads with my centrefire rifles. The answer for me is TEFLON gasfitters tape, instead of the conventional lubes. I first came across this idea from a Mike Venturino article of about 30 years ago, when he was just starting the writing business. I don't size. Gasfitters tape is.003 thick and 3/4" wide. The stuff in hardware stores isn't enough. Cut off a bit, at an angle, and wrap a bit more than a full turn. twist the bottom closed over the base. Just seat over your powder topped by a bit of dacron (Teddy Bear Guts!)
I use two levels of load. 1. about 9 - 11 gr of Unique, or something near it, for a 32-20 type load. (With a scope on 4-5 power, the POI is usually at the lower point of the DUPLEX reticle.) 2. 3/5 capacity of 4895. this will provide a 30-30 / 38-55 type load.
For what it's worth!