Here is what you do to ANY brass, Lapua or not, to make them shoot properly. If you are not improving the cartridge (i.e. making an Ackley) or completely forming it, like making a BRX or Dasher, you can make virgin brass fire as accurately as fireformed brass.
1.) Expand the necks. If it's a .22 cal or whatever, get a .22 expander mandrel and expand the necks. This will push most, if not all, of the imperfections in the neck to the outside. TRICK: when expanding the case necks, run the case up in the mandrel body die and then back off, spin the case about 1/3rd turn, run back up in the die. Do this 3 or 4 times (it takes an extra 5 seconds) and you will feel the case gong up in the die very smoothly>>>then you know the imperfections have been pushed to the outside.
2.) If it is a "no turn neck", at least skim-turn your necks to about 90 percent "clean-up". This will turn off the imperfections you just pushed to the outside.
3.) Anneal the necks>>>even on virgin brass
4.) Chamfer the inside and outside of the case mouths.
5.) Heat has a way of moving metal. So, run the brass back thru the mandrel to straighten up the necks>> using the spin method once again...
6.) Using a "used / carboned up" neck brush, vigorously brush out the necks.
7.) Prime the case
8.) Using a Q-Tip, swab out the inside of the case neck with Imperial DRY neck lube.
9.) Charge your case with powder,
10.) Seat your bullet.
If you do this to virgin brass, you will not see a difference between the virgin and fireformed brass. DON'T do this with virgin Lapua (or any brass) brass and you are kidding yourself!
