I spent some time piddling with fixed loads in my ol' .32-40 a few years ago when I'd grown curious whether the assorted molds I had were worth shooting in it rather than the breech-seated loads otherwise shot. It proved to be pretty rewarding, with the best of the experiments producing groups that were not much different than the bs ones were (still are ). Of course, you need to work to see what those two of yours like the most, but I won't speak of that to you. Rather.... to answer your question about neck tension, I got the best results by running the cases into a old 8mm Mauser die that sized the case neck less than the pair of .32 die sets I own. In other words, just enough to hold the bullet where I put it and drove to the range. I sometimes seated bullets way out, just barely covering the base band. Then, at the range, I used my old Ideal tool to try different depths to see how that changed things. Mostly found that seated just nudging the rifling with the first band was good, but very little different than a tad shy of touching. Of course, with the delicate tension, no bullet could be jammed into the rifling because it would just freeze up and get pushed into the case-inconsistently I feel. Whatever, the cause, these were never as good as the ones that actually fit into the rifle easily. Hope that this is of some use to you. Let us hear how it all goes.

turning.... I did that a few times and they turned, but like Vall, I don't have a way to precisely measure the tension or the 'squeeze'. My neck size was predicated on the results I got using the available equipment. the attempts were: no sizing at all, a pair of different sizing dies and the seaters for .32-40, a shot at the sizer of a borrowed .32spl set, and finally an old 8mm die picked up at a show. Nothing real scientific, just trying out a pile of ideas and bullets.  Assorted amounts of annealing were tried but don't think I ever made much of a conclusion there. Just goofing and the 8mm was abut a thou bigger than the other sizers.

my intent wasn't to hit a particular amount of force needed to move a bullet in the case, but rather, to get the bullet to remain in a chosen position but no squeezed so much that bullet damage occurred. I arrived at the amount of dimensional sizing for that purpose and to minimize the working of the cases to prolong life. Just a wee tick of sizing was needed. 
I had tried to use fatter bullets in wholly unsized cases. Only one mold I had provided a bullet that fit. And, either my rifle disliked that one or at least disliked that size. I didn't travel far down that path, but found very pleasing results with the minimal sizing and bullets more to my rifle's liking. Then I went back to breech seating like always.