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On .38 sp just take the flair off the case for normal loads, +P loads a light crimp is ok but not always necessary. For .357 mag the amount of crimp depends on how heavy the load is, and yes for a good consistent crimp of course all cases should be the same length. Now, if your going to use either of these in a lever action both need a good crimp to prevent bullet set back while in the tube. I use the Lee collet crimp for my .357 mag loads with Extreme copper coated bullets, easier on the brass, a little more tolerant of small variations in case length, and much less likely to cut through the copper layer on the bullet. I do seat and crimp all of my ammo in separate steps, I just feel I get better results this way.
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