The other day I found a few shotgun cartridges lying about at the local field course and I thought i'd set up a trick shot. The idea was to hit the first lone cartridge that's sat on an elder twig and if hit square on the arrow would hit the 3 stacked cartridges. There is about 5-6 feet between the two targets.
When doing this sort of shooting I normally put one on line but over the top then one left at the correct height then one left and then last arrow on target. I find this is better for getting dialled in to pin point accuracy, just shooting in the same place doesn't work as well for me.