Having scratched my Ancient gaming itch with the 3x3 experiments, I was still unhappy with my ACW gaming efforts. I think the ACW variant of Rifle and Kepi has the most legs, but it takes a fair bit of work to set the scenarios up and I'm really not sure I can be bothered to do that every time.
I have been very taken with http://hereticalgaming.blogspot.com/ and his project to fight through a load of One Hour Wargames scenarios using Simplicity in Practice. I've played SiP before and I think it needs a lot of work to be a passable ACW game, but I was a bit baffled to find no mention of the ACW in Neil Thomas's Nineteenth Century Warfare rules which I've also got. I was sure I'd read some of his ACW rules somewhere, then it came to me, there was a set in his Introduction to Wargaming book.
They are a pretty basic set, and include some very similar mechanisms to both SiP and the Nineteenth Century rules, but with some ACW specific tweaks. I particularly liked the propensity of units to run away and reorganise rather than just stand there and lose lots of bases, as well as the random unit quality which varies by year.
Time to break out some toys. I went with OHW Scenario 27 'Disordered Defence' which is based on Shiloh in 1862, but played with the ACW rules from Into to Wargaming.