Tom is not just whistling Dixie about the 14 rib. This is probably why the Varmint rifles are generally more accurate - heavier barrels aside. Tests showed that the 1/4 rib would/could expand .007" in length. This of course makes it push on the action as well as arching which can cause other problems like double grouping or group shift with temperature.

Some guns exhibit all the accuracy problems, while others seem oblivious right from the box. Bedding the forend to the hanger, with no tension anywhere on the barrel is one method of bedding, while others say to bed solidly, and still others to install an 8x32 screw from the front of the hanger up to touch the barrel, giving even more adjustable pressure/tension at that point.

I relieved the touching at the rear of the rib on my #1 in .218Bee and was immediately rewarded with improved (excellent) accuracy with my Lil'Gun loads. Note - the rib screws usually seem to have been installed by a very large man with a large handled screwdriver.

Reducing the 1/4 rib to a 2 piece rib is one method of reducing elongation.