Doug, Here is what the the US Govt stated in a report dated 1856 that was in a document titled "Reports of Experiments with Small Arms by Officers of the Ordinance Department, U.S. Army". I am not going to try to retype the whole document as it is many pages in length but this portion deals with your query;
"Before enveloping the balls in the cartriges, their cylindrical parts should be covered with a melted composition of one part beeswax and one part tallow. It should be applied hot,in which case the superflous part would run off. Care should be taken to remove all of the grease from the bottom of the ball, lest by coming in contact with the bottom of the case, it penetrate the paper and injure the powder".
This document continues on for two more pages, describing in detail the assembly of the cartridge but the short answer is... Dont put lube in the hollow base. If the grease grooves are properly lubed with the proper lubricant then lubing the hollow base is unnecessary. I can fire my CW Springfield hundreds of times without cleaning or wiping. The proper lube is the key. Cheers, Bob E !!