That's intriguing...
Because one of the sources for my 200-300 yard bencrest gun specs was
www.6mmbr.com - including many of the Guns of the Week winners:
http://www.6mmbr.com/gunweek058.html
http://www.6mmbr.com/gunweek008.html
http://www.6mmbr.com/gunweek007.html
and I'm sure many others. Barrel length is still a matter of personal preferences, the 20" tube isn't a de-facto standard, not by a long shot. Let's not forget, we're dealing with premium barrels here, some held to 1/10,000ths of an inch in bore dimension tolerances. (Krieger, the people I interviewed with and start working for in the next few weeks. Put that in your name-dropping folder next to Dan Lilja...) BTW, Dan would really like to sell you a stiff barrel. All the premium barrels from reputable folks ooze quality, and whether 20" or 26", will still group like there's no tomorrow. They're not necessarily the cat's meow for tromping through the woods looking for game, but the folks who make those benchrest barrels will sell you a heavy varmint or sporter contour with the same attention to care in manufacture.
Yes, I've owned 20" .308 and .30-06 bolt guns, in all sorts of barrel contours and configurations, including one ugly Mauser-actioned beast with a 20", 1.50" diameter barrel salvaged from a pressure test rig. I've even got a 22" Krieger-barreled gas gun. (I've never seen a 24" or 26" M14) My conclusion has been that matching the round to the chamber and barrel system does more for accuracy than lopping off 6" of tube. Hence, for my demands on accuracy, I'd still go with a 24" to 26" barrel for a varmint/target/hunter, like the ones listed above in the survey. They all have more than adequate barrel thickness needed to dampen harmonics, as opposed to something, say, from a Winchester Model 70 Featherweight. Regardless, I can work around barrel harmonics if the longer barrel has noticeable "whip" compared to an 18" - 20" tube. People get so hung up on barrel stiffness, and they forget it's not the sum total of accuracy. A thin barrel can be made to shoot rings around a 2" diameter monster, it's a matter of tuning the load. We're already seeing barrel tuners in use, and they'll play a bigger part in the future. The Browning/Winchester BOSS was just a hint of things to come.
I cannot, however, add velocity to the bullet after it leaves the muzzle crown on the shorter barrel. I'd really like to have the extra 150fps when I'm putting venison on the table. The author of the thread will probably never find the difference in accuracy between an LTR and PSS. Differences in ammo alone will give greater variation in group sizes.