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If you used a FCD with soft plated bullets you could have actually lessened the amount of neck tension by swagging the bullet down. Plated bullets used in revolvers are for light loadings using a taper crimp. These loadings are generally mild enough that "bullet jump" is not a concern. Roll crimping a plated bullet without a cannelure or even over taper crimping them can cause the case to cut thru the thin plating resulting in inaccuracy and/or plating separation. You enclosed picture shows how much your crimp deformed the thin plating and the soft lead core beneath it. This certainly could have contributed to your inconsistent OALs.
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