I lost track of how many rounds I've put through mine. More then 600, maybe 800? I have measured considerable throat erosion and have to adjust the seating depth each time I load new rounds. Base to Ogive is now 2.850" for .015" off the lands.
Ive also found it is easy to over pressure the Lapua brass. The webbing or solid portion around the flash hole will get hammered and expand slightly with each firing. This is the cause of the brass to stick after reloading it 3 or 4 times. Each time its over-pressured the solid webbing expands and that part of the brass is NOT re-sized in a FL die.
My favorite load is 89gr Retumbo, GM215M Primer, bump the shoulder back .0015" from fired length, trim to 2.715", size the neck for .002" neck tension, 300gr Scenars seated .015" off the lands. 2680fps and very accurate out to 1700 yards. Recorded many hits out to 1900 yards. Leaves a nice group at 1000 yards.
Anything more than 90gr of Retumbo or 92gr of N570 will beat the brass up and cause them to stick after 3 or 4 reloads. I just picked up some Reloaded 33 to try.
Took it out a few days ago with a buddy from Phoenix who has never taken his Remington 700 (308Win) out past 200 yards before. So to start him off we found a good setup at 945 yards. Using shooter my first shot was a miss, elevation looked good but splashed about foot to the right of the steel. Adjusted the scope .2 mils left and the second shot was a near center hit on my steel. I put about 20 more down range and only missed one (flyer? pulled it?).
The large lead splashes are from my 338Lapua, the small spots are from my friends 308.
Looking down range to the target 945 yards out,
Calculated just shy of 2000ft lbs of energy at the plate for the 338LM. Each hit would case the 3'x3' 1/2" 180lb steel to swing about a foot. the 338LM hit with some serious authority down range. You can just see the edge of the shrapnel trench near the bottom right of the photo. Again, the large lead splashes are from my 338LM the small hits are from a 308Win.