Regarding the issue of buckling cases when crimping. It's a common problem and certain to happen with the longer cases if you used mixed brass or brass with varying lengths, which I do most of the time. The cases which are to long can often give bullet pulling problems with stout loads.
To solve this problem, I have for years, seated and crimped my revolver bullets with the seating die turned in at least one turn beyond where it would make a good crimp with a full lever stroke. Turn it in more than one turn if need be, but the idea is to work the press in such a postion that you feel the crimp close in and go no farther. If your press has a lot of leverage at the end of the stroke, two turns may give a better feel.
Maybe a bit better explaination of the problem is is order. At the top of the stroke pressures are extreme, and there is almost no feel of what pressure is, because the operating handle may move 3 or 4 inches moving the ram up only a few thousandths. When the seating die is screwed in farther than normal, there will be a good feel, and you'll feel the case mouth bump into the crimp shoulder when it hits home. Be sure you BARELY feel it come tight and you'll find bullet pulling to be a thing of the past.