That's disappointing to hear. All the Lapua brass I've had (.308 W and .30-06, mostly) has had about half the neck wall thickness variation of LC and none of the internal flash hole burrs.
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I was speaking more to neck wall thickness and half for me with the Lapua would make my LC necks .004 thicker on one side then the other and I'm just not seeing that . .003 sometimes but a .0025 to .002 is not to uncommon . My Lapua brass is not .0015 or better .
As for burs on the flash holes . Yes my LC brass does have some burs , However out of the few thousand 308 cases I have . I've not come across one that the flash hole was actually obstructed , really in any way .
Here are a couple examples of what I see . Some of these are 223 cases but I believe represent what I see pretty much with all . Yes there are burs but they are pretty much out of the way and don't interfere with the primer flash .