During the last three years or so, I've been trying other brands of .223 Rem brass as potential alternatives to to Lapua for F-TR loads with 90-95 gr bullets. The two primary reasons for doing this are the relatively poor brass life with Lapua and the relatively "warm" loads I have been using (3-4 firings tops, before the primer pockets become too loose to use), and cost.
What I can say at this point is that none of the brands I've tried meet the Lapua standard as a whole. They simply aren't Lapua brass, none of them. The reasons vary, including mediocre precision, the amount of work required to remove flashing and uniform the flash holes, relative thickness of the webbing (thicker webbing can sometimes help improve brass life with stout loads), and non-uniform case and neck wall thickness. The relative weights of each of these differences are not necessarily equal, and each shooter must decide for themselves which parameters are most important. For example, I place the highest level of importance on precision, with case life coming in close behind that. I can live with a little extra work cleaning up flash holes, or sorting out cases with non-uniform case/neck wall thickness, as long as the precision is acceptable.
In my hands, prepped virgin Starline brass gave precision that wasn't anywhere close to Lapua. Note that I am not trying to create any dissent here with other satisfied users of Starline brass, merely reporting my observations. The uniformity of case and neck wall thickness was not so great in the batch I tried. It also seems to be hard as nails, which may have been at least partly to blame for the observed mediocre precision. I didn't actually try this, but for users of Starline brass, my gut feeling is that precision with virgin Starline brass may benefit from annealing straight out of the box. One big plus of using Starline brass (if one can generate acceptable precision with it) is that the primer pockets will survive the stout loads F-TR shooters tend to use with the very heavy-for-caliber bullets much better than Lapua. Regardless, other F-TR shooters have been using it with success for some time, and it wouldn't surprise me if the precision improves markedly once it has been fire-formed and given a full workup. However, I haven't reached that point with it due to the mediocre precision I obtained using prepped virgin brass. Prepped virgin Lapua brass shoots very, very well, so that is the standard to which I am comparing other brands.
Lake City brass has the thickest webbing of any brand I have tested. It also seems pretty hard. As such, I would expect the primer pockets of LC to survive loads with heavy bullets much better than Lapua. The primary issue for me with Lake City brass was the really excessive (IMO) amount of flashing around the flash hole, and the number of cases with really large variance in case and neck wall thickness (i.e. non-concentric). Using a case wall concentricity gauge, I estimated I might have to cull as much as 40-50% of the cases due to this issue. When combined with the flash hole issues, this is why I didn't pursue the use of the LC brass any further.
FWIW - the one brand of brass I have tried that gave precision comparable to Lapua using prepped virgin brass was Norma .223 Rem brass. The flash holes of Norma brass definitely require a little more work than Lapua. It also has slightly thicker webbing than Lapua. However, case weight with the Norma brass is slightly lighter than Lapua, even with the thicker webbing. I believe this is because the upper case wall and neck wall of Norma brass is slightly thinner than Lapua. Not surprisingly given the relative case weights, the internal volume of the Norma brass is slightly greater than Lapua. The best news about the Norma .223 Rem brass is that it costs about half as much as Lapua, yet still generates comparable precision. I do not yet have sufficient firings on the Norma brass to make any comments about its longevity with stout loads. If the case life of Norma .223 Rem brass is only about equal to Lapua, I would still use it without hesitation due to the comparable precision and it being about half the cost of Lapua.
Testing various manufacturer's brass is one way to be certain that you have identified an alternative source of brass to Lapua that still lives up to your standards of precision and brass life. Buying one box of this brand, or one bag of that brand for testing purposes may seem a bit painful, but the cost of a single small package of brass usually isn't too bad. Further, a little testing may save one from buying a large quantity of brass that may not live up to expectations, which would be much more painful, IMO. Every rifle setup is different, so each different brand/Lot# of brass may not necessarily behave the same in different people's rifles. A little brass testing up front may help find the brand(s) that work well in a given setup, but it is not without a little cost and some time and effort. Given that for most of us brass is not a single-use item like bullets/powder/primers, I feel like the small extra effort is worth the cost, but everyone must decide that for themselves.