I want to go, but weathers not looking so good.
Though I have a few friends who were interested in going, I have 5 SL-68 pumps. Trum, im sure I can get one going for you. I have rebuilt them all, my only concern is not getting them to chrono high enough. They need new springs and the barrel bore on these is quite large, so that causes it to shoot a bit slower. But I heard you can put spacers in to help that.
I've also thought about trying tape in the barrel to create a 'control bore' to help stop roll outs and possibly a velocity boost.