Just for fun since I tried looking it up and didn’t see any data on if mixing lots of Lapua Brass matters. I have 400 Lapua srp, 2 different lots that has all been fireformed and was trying to determine if it was worth the pain of keeping it separated. Lot 1 is about .5gr lighter than the lot 2 brass. So I took 5 of each and loaded them up with the exact same load and round robin’d them. Not a huge sample size, was just curious.
40.0gr H4350
140gr eld-m
CCI 450
Group size was slightly better on Lot 2. I will probably end up mixing them after the next firing.