Posted by Pete van Meurs on
URL: http://oldforum.flyshooter.com.au/Outside-Neck-turning-Inside-Neck-Reamer-tp5706943p5706946.html

There are a few more things to consider. If your chamber has a tight neck then turning is mandatory. Also if you plan to neck-size your brass rather than full length size then I consider turning is advantageous. My preference is to full length size every firing which allows a bit of neck wall thickness variation to be tolerated.
Probably the most important step is to check your new brass with either a neck concentricity gauge as made  by Redding or with a neck wall micrometer as made by K&M. I grade out those cases with more than 0.0015" variation and identify them with a file nick in the rim. These are used for foulers and sighters. Normally Lapua cases would only have 5 to 10 such in every 100. Some other brands can have surprisingly good consistency in certain batches.
All Redding, K&M and Lapua products are available from Pro-Cal (03-52811380).

Pete van Meurs