It is frequently mentioned that the earlier L61R and L579 (and the L461 as well?) had lighter barrels than the later versions. However, I haven't seen actual dimensions posted. Is there a database of barrel contours? If not, it might be useful to compile one. That would be of great help, for instance, to anyone who is trying to find a stock to match a barreled action. I'll start it off with one data point. Early L61R, s/n in the 9000 range, .300 H&H Magnum. Measures 0.71" (18.1 mm) at the front of the stock and 0.6" (15.2 mm) at the muzzle. If several of us mike our barrels, we should be able to get a pretty good handle on selecting a stock to fit a given barreled action. I'm not aware of barrel variations in the L46 rifles, but if there were, that would be good to know as well.