No. The idea is to zero out the indicator on a sized piece of brass, then seat a bullet long into that same piece of brass. It doesn't matter how long, as long as it contacts the lands. When you measure it, the case will protrude by ever how far it is from just touching the lands(long). So, we start with the indicator at zero, load a long dummy round and lets just say the indicator reads .076(random number). Your touch point is .076 shorter than your dummy round that you just measured. If you want to load a dummy round at just touch, simply seat your bullet .076 deeper in the case. The only thing that touches the case is the light spring pressure from the indicator tip. So it's both very light and very consistent. The tool really does work great. You can also use it the check shoulder bump precisely. Just use an unsized case, zero out the indicator, then size the case and check it with the tool. The indicator will give a negative number that is your amount of bump, in your actual chamber. You just have to be sure that the unsized case fully bottoms out..well, both but the sized case should bottom easily where the unsized piece might take some thumb pressure, depending on how tight it is in the chamber, of course. You can sort by bump and/or seating depth really quickly with the tool, if you're so inclined. Super simple and fast.Do you get the same measurement regardless of how long you seat the bullet?