Most of my big game rifles have custom barrels of one form or another..using a break in procedure very similar to what you have described--they are 2 to 3 times easier to clean than any factory barrel I have..with the fouling on longer shooting sessions being noticably less as well..

You are correct,in the assertion that breaking in will allow for the barrel to being cleaned easier as time goes on--this is true for both factory or custom---and if they are fouling less with less deposits being picked up and staying in the barrel, logic would say accuracy would also last longer with the less fouling..

Personally, when I go shooting prairie dogs--I will clean my rifles every 50 rounds..I usually take 4 to 5 rifles along on a shoot so I can shoot 3 to 4 shots and switch to another to let the barrel cool.. by the time one has 250 rounds through the guns it is usually time for a break anyway..

Typically if I am going big game hunting with a rifle after going to the range -I will fire one or two rounds through it from a clean barrel and go hunting leaving the fouling shot or two until I am done hunting..I have read numerous articles on this and visited with barrel makers as well --all have agreed on this practice--it seems to work.

Ripp