Dave,
Apologies for the time delay since my barrel length question..
I was thinking more along the lines of a fairly heavy profile 20" barrel -maybe 22" but not much more.
I was basing this on 2 (mis?)perceptions:
Benchresters appear to use stubby 20-odd-inch barrel lengths (based on only on my observations from books and articles; I have no first hand experience of benchrest)
I want the rifle to be fairly handy for walking slung across my back (don't find weight to be the issue, to me it is rifle OAL that can make the things awkward), but good enough to drop prone and take an easy accurate shot out to about max 400m.
Why (other than increased MV) are you drawn toward a 26" barrel?