Yeah, but remember that the instant indicator is just to make measurements relative to the amount of shoulder bump applied. If it fits in the indicator and indexes off the shoulder, then that is all you need to know. No need comparing the actual datum point from one caliber to the next. Measuring a 243 case, sizing it, and then measuring it again is an apples to apples comparison. Remember, the instant indicator doesn't give you an actual measurement; it is not a caliper. The purpose of the tool is to measure variance, which it does quite well, especially in a T7 turret press.