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One thing I haven't seen mentioned yet is that if you want to use a Lee factory crimp die and roll crimp with it and get consistent crimps you have to trim your cases to all the same length.
With out trimming them roll crimping consistently would be an exercise in futility.
For light to medium .357 mag loads with plated bullets, I chamfer the inside of the mouth and use a taper crimp die on them.
Chamferring them is very important in not having a sharp edge inside the case that cuts the plating.
The best, easiest thing to do would be to chamfer the inside of the mouths, you only have to do it really once. and go with a taper crimp die, they don't care about different length cases.
just straighten out the neck sizing flare with the taper crimp die on the longest case you can find and your good to go.
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