Nosler and Norma have the 'standard' magnum market in a stranglehold. I don't believe there would be many to make the switch from Nosler or Norma to Lapua solely because of the name... It'd be more dependent on whatever they could get their hands on at the time.
Lapua brass is the only answer for the .338lm and most people know that. I think that with how successful they've been with the .338lm, and the hold they have on that market, the cost-benefits of getting into the "smaller" magnums wouldn't be enough to justify investment.
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