We used to have Bowling Pin shoots here in this area and will hopefully have them on a regular scheduled basis this spring and summer. We shot 5 pins at 24 feet, with both tables, Old doors on saw horses! Both shooters on the line at the same time, usually with guns loaded and pointed at a 45 degree angle, till the comand to fire winner was the first to clear the table.
I personally don't like shooting against a clock! In the case where a good shooter was up against a shooter that was not as good we usually handicap the good shooter. That handicap can be starting with the gun on the table, to being on the table empty, having to shoot with the weak hand. We also will on occasion with the good shooters that have a sense of humor we have been known to make the shooters place there guns on the bench's and swap places shooting with the other guys gun. Things like that can make things really fun.