after rereading my Woodleigh manual for I don't know how many times, I finally stumbled across a reliable method of determining C.O.A.L. I'd been looking because I kept struggling with accuracy and velocity on a TC Encore 308, and while I've been getting stellar accuracy out of my 6.5x55SE, velocities weren't very close to what was published. Turns out that the throats on these 2 rifles are much deeper than I realized them to be. I'd been working loads for the 308 with ELD-X 178 gr, VLDH 175 gr, and Gold Dot 168 gr. The books on all 3 loads show a COAL of 2.800". Using what I call "the Woodleigh method" that some of you probably already know about, I determined that the Hornady and Berger bullets show a COAL of 2.900" when seated to the lands. A 0.1" jump is quite a jump, and both accuracy and velocity were not anywhere near what they are in my other 308, and the TC has a 26" barrel, to boot. Velocities were routinely 100+ fps slower from the TC than they were out of my Savage 10's 24" bbl. To get to COAL, it's a couple steps. Also, bear in mind this doesn't give an EXACT COAL, but close enough to work with. I've tried Hornady's COAL tool with inconsistent results, and a few other methods demonstrated by YTers, all to inconsistent results. you need a wooden dowel that is at least half the bore diameter. A 3/16" dowel will have this covered up to about a 9.3mm bullet. I don't know what a 0.25" dowel will fit in that's smaller than 308 bore, but it certainly own't fit in a .264 bore. close the bolt all the way, then stick the dowel all the way down from the muzzle until it touches the bolt face. hold a fine pen/pencil to the dowel at the crown, then rotate the dowel until you've completed the circle open the breech, drop in the bullet, then gently put a brass behind the bullet, then gently push the bolt to the brass. you don't want to force the bullet down any further, but you want enough resistance to feel when you... stick the dowel back up the barrel (helps if the barrel is angled down a bit). Same procedure as 2, make another circle. measure the distance between the 2 concentric circles, this is max COAL with the bullet on the lands. back off 0.02 ot 0.04 from max COAL as is customary, and work from there. For my 6.5x55 loads, the book on the ELD-X 143 I am getting good accuracy out of is 3.025", and not-quite-as-good with NP 125 grain is the same COAL. When I measured the dowel, COAL for the Hornady was 3.2", so looks like I should be seating the bullets out to about 3.16 - 3.18. That is WAY, WAY past what Hornady says, and while the published Nosler COAL wasn't as far off, it was still WAY off, with an on-the-lands COAL of 3.16" so looks like I should be seating them out to about 3.12 to 3.14 Curiously, Woodleigh 160 gr and Hornady 143 grain both measure to an identical COAL of ~3.20 still need play around a little to see if those COALs will work, at least for my 6.5. Don't have to worry about magazine fit for the TC. Anyway, if you've been struggling with this the way I have, hope this helps.