The best way to ensure accuracy is to get the right bore to paint match. As paint varies in size even from batch to batch within the same make & as the weather conditions change, the only way to ensure bore/paint match is to have some form of adjustable bore, e.g. a Freak set. The Freak is a 3-part barrel with separate front & back and a series of inserts (sort of sleeves) of different sizes that fit into the back. You can very easily change the insert to match the size of the paint you are using that day (literally takes a couple of seconds).
Another advantage is that if you change your marker, instead of having to replace one or more barrels to fit the thread you only have to buy a new back.
