Re: What difference does the groove count make in a barrel?
IMHO, 3 groove barrels are much better for barrel burners such as the 6mmx284. This is because the lands are twice the width of the lands on a 6 groove (at least on Lilja barrels, I dont know about PN barrels). This will hold up under the heat a bit better than a narrow land which will save the throat area a bit. It isnt a cure all but can add a few usefull shots to the life of the barrel. Maybe 10-20% ish.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.