If a second shot is necessary, I doubt if I will have 3minutes all that often to get it off. So it seems a little contrary to wait 3-5minutes between shots as the author recommends to find out how well your LW performs from the bench and equate it to the field.
Some rifles do walk their shots as they warm up, and it is worth knowing about (and doing something about if you can). My little drilling (6lbs bare) starts to walk its shots after the first two or three, for example, unless given a bit of time to cool down. You won't know that it does if you never try.
Having said that, I usually take my time when at the range, in order to minimise bore erosion.
