I just use the normal jacketed bullet load data for 35 Rem, since the max listed loads are well in the range for cast bullets. I used to have one of those barrels for the Contender, it shot the RCBS 200gr. FN quite well over a stiff charge of 3031. Cast out of water dropped wheel weights, lubed with 50/50. For the Whelen, it'll depend on your particular rifle but that same bullet in my rifle worked great up to 2200 fps using IMR 4895.