As per my recent thread on the Nosler Partition I am approaching the stage where I will be thinking about fine tuning a load and almost without fail everyone has recommended working on COL so that is what I'm going to do.
I've loaded some partitions for testing to the 308W max of 2.800 inches and looking at my magazine on the Blaser I'm not sure I will be able to go significantly longer than this.
I've never messed with COL before and have no idea how far the lands are from my bolt face or how long I need to make my OAL using the partitions to set the end of the ogive a given distance from the lands. I am aware there are various "make shift" methods for doing this and also a range of things that can be bought to do the job (the precision mic for example).
So, what methods are recommended for measuring the distance to the lands and converting this to a correct COL taking the ogive into consideration etc? Is something like the precision mic worth the money as it looks like it will give repeatable results while many of the make shift methods appear, to be, to be prone to some vagueness?
As ever all views, advice and opinions are gratefully received.