The problem with casting , lubing and shooting is the size of the bullet. If lucky, the as cast size is exactly right , lube and shoot is fine. But more than likely the bullet might be larger than you want. The alloy used can also affect the as cast diameter. This is when you have to size. Proper fit of bullet, throat and bore are just one of the many aspects of getting cast bullets to perform correctly.
Most people who ,don't want to do the sizer thing, get a Lee tumble lube mould and try it out. If not satisfactory, then look at sizing. The low cost of Lee double cavity moulds lets you try out several different designs without breaking the bank.
I personally do not care for tumble lubing, or the tumble lube design of bullets. I'm old school. I did try them but didn't care for the results. Some people love the TL design and get good results. ( I think the bullets are ugly , that's just me) . I use a Lyman 450 lubri/sizer. the 148 gr Lee wadcutter mould I use is the 358-148-WC, not the tumble lube design.
Floydster...which Lee wadcutter mould were you refering to the standard WC design or the tumble lube design?
Gary