I've searched quite a bit on various forums and get a variety of definitions. None of which I can accurately relate. So, here is my question. Based on SAAMI 30-06 the measurement from base to the end of the case is 2.502". Measurement to the taper to inside neck diameter is 2.5228" (.0208" difference). the measurement to the beginning of the lands is 2.7442". This results in a distance of .2422" from the front of the actual case to the beginning of the bore. Assuming that the lands begin at the exact point of the beginning of the bore (2.7442") is the "freebore" then .2422"? I guess what I'm asking is if the "freebore" is the distance from the front of the case to the beginning of the lands? As a case in point, my Remington 700 30-06 has a base to lands distance of 2.846". Using the SAAMI distance (case length) of 2.494" base to end of case, my freebore would be 0.352". Ammunition loaded to placate my Marlin XL7 (with 165 grain Nosler Partitions at 3.26" COAL & 0.036" jump) would have a "bullet jump" of .240".