I PM'd the following to Dave300 but i figured others may find my experience helpful.
Dave,
It's been a while since I've played with the Maxus, thanks to my new found fascination with 308ARs.
I was mainly trying my hardest to make 000 thru #1 buckshot work for me.
In the end, after spending tons of money on choke tubes and loads, I found that the factory investor plus full choke gave me the best performance with 3.5" double ought thru #4 buckshot. I wish I had patterned the factory tubes prior to ordering Rhino choke tube, which was a waste of money.
I think though that for hunting coyotes, #4 buck shot thru BB is where the optimal shot size lies. For these shot sizes, I highly recommend the kicks high flyer choke tube, specifically, their "Full" choke (actually a modified). The x-full (improved modified) works well also, but may be a touch too tight closer in.
I have gone clay shooting & dove hunting since, and I have to say that the Maxus throws very tight patterns at very close range with the Kicks high flyer "Mod" choke (actually improved cylinder). I find myself switching to the factory improved cylinder when shooting clays cause the patterns are too tight with the kicks choke.
My recommendation is to buy the kicks high flyer choke tubes. The downside to them is that they can't really be used effectively with the Federal flight control wads, the Hornady buckshot ammo with a flight controlish wad or the newer Winchester wad designs. These loads require the use of non ported chokes, So u may want to get the kicks chokes that are not ported.