I was always told the lube on the conical assists in the loading of course. It also helps the conical engage and use the rifling on the way out of the barrel. The lube also helps to soften the fowling which will occur from the ignition of the powder. The lube will also help protect the conical from the heat of the ignition blast. Many even go as far a putting a lubed bore button or wonder wad under the flat based conicals for further assistance and protection. It will help therefore reduce lead deposits in the barrel of the rifle. It probably help in the over all accuracy of the conical although I have not tested that theory.

Can you shoot a maxiball out of your rifle without lube? Sure can, your rifle. Is it dangerous, well not until the barrel gets all leaded up and you start to short load or have other loading problems....