Off the lands, free bore, running start or off against the lands with a deat stop start.
In most reloading manuels there is a minimum length listed for a particular load/powder/bullet. for those that understand the term relative the measurment or difference between minimum length and off the lands can be measured if they understand transfers and standards. Those with limited abilites shread the neck to make it look like a squid, others take a pair of pliers and crush the neck of a formed case for bullet hold not thinking when the case is chambered the neck will form the neck, push the sides together and as a results loosen the bullet, sounds good but when the bolt closes, the chamber gets dark, and the lights go out.
I drill the flash hole/primer pocket to a diameter that will accommodate a cleaning rod, I size the case, seat a bullet to minimum length then measure the overall length, then remove the bolt, chamber the test case then use a cleaning rod to push the bullet out against the lands, then remove the case and measure the overall length, the difference between the minimum length and maximum overall length is the difference between the two measurements as in off the lands with a minimum OAL case.
Transfer, the dimensions of the chamber for (against the lands) maximum overall length can be transferred to the seater die (if the neck of the test case does not look like a squid) by backing the seater plug/stem out of the die and by backing the lock nut on the die off to prevent contract until adjustments are made. Install the test case in the shell holder, raise the ram, lower the die until the crimp portion of the die contacts the mouth of the case, then back the die out 1/2 turn and secure the die to the press with the lock ring, next adjust the seater plug/stem down to the bullet once contact is made secure the plug.stem to the die with the lock nut. This method turn the seater die into a precision/micro adjustable seater die with the aid of the dial caliper, all one needs to be able to do is measure the height of the stem above the die then zero, if the reloader wants to seat a bullet off the lands .020 thousands, with the seater stem zeroed, loosen the small lock nut, lower the stem .020 thousands then secure the lock nut and start seating.
A friend built 5 rifles, all in 7mm Gibbs, same receivers, barrels etc., one shot patterns, not groups, he asked for help, he did not like the ideal of drilling the primer pocket/flash hole but I thought it was a small sacrifice, I removed the bolt, chambered the test case and then pushed the bullet,,,out of the case, it skidded forward through the long throat then stopped at the lands, the bullet was 170 grains so there was nothing suspect about the length of the bullet, we went to the range with 100 cases loaded with different bullets, powder and every configuration we could think of, there was a small window in the middle that produced one hole group, to either side of that window the groups opened up to patterns. He had the rifle bore scoped, the barrel had been hot at one time but not eroded.
To correct the chamber, set the barrel back .200 thousands and live with the barrel gap down both sides of the barrel channels, open the bolt face, open the magazine and chamber in 7mm Weatherby, or purchase another barrel, problem! he dropped the reamer while attempting to make sizer dies.
.100 off the lands, measurements can be obtained by 'off the lands' off the lands can be obtained by knowing the difference between minimum length and zero off the lands, there is no guarantee the chamber will allow .100 off the lands and not be shorter than minimum length.
I am a fan of the running start, I know moving the lawn and trimming the hedges is a good start when trying for immediate neighborhood acceptance, seating the bullet against the lands are a form of immediate acceptance in the world of reloading, but, in the world of reloading there is most always one factor that is omitted, time and in reloading there are factors that are left out, if for some reason I decide to seat a bullet against the lands, I am going to avoid full loads, this may not be a problem if the bullet is 308 and being shot in a .311 barrel.