RE: .019, .029 or .040 sights
Right now I have my 20 and 30 with .019 and the rest at .010. This is the first time I've varied the sizes and I really like it. On my Spot Hogg the pins will all be .019. I'd just play with it a little and see what you like, for me I'm going to use the smallest pin I can that will still pick up adequate light in all situations.