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Don't know of any such, but it should be possible to get a kind of pre-seat reading by using the depth gauge function of a dial caliper. Bridge the end of the caliper on the bottom edge of the die and lower the probe until it touches the seating stem. You'd have to make an allowance for how far off the shellholder the die sits, and also for the distance from the shellholder lip to its bed where the case sits, but both those would be a constant unless you change your die setting.
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