Bruce,
I know everyone has there own way, but I've drilled holes before splitting and split without drilling, drilling holes do take more clean up but it is easier. If you use a good chisel that is evenly ground on both cutting sides and bring to white heat(just under burning) you can split a 3/4" bar in 1 heat if you move quickly. I always split from the bottom first ALMOST all the way through then quickly flip and finish splitting, just keep your chisels cooled with grease. The drift I made from the axel has been used on several and it shows no wear but I keep it well greased, it leaves a good
1" - 1 1/4" oblong hole and a nice tapper. After you split if the hole is a little uneven just even it up using the anvil horn, then drift but don't worry about a finished looking hole until after you have finished shaping the hawk. Then drift from the top down and your done.
Just be careful because it is terribly hot.
Good Luck
Bill