The Lapua brass is quite a bit thicker than the Hornady brass - Alliant used Hornady brass in their load data.
I haven’t measured Hornady brass case capacity but all the info on the interweb says it has a fair bit more capacity than Lapua.
I would imagine 43.9gr in a Lapua case would be compressed, but the Alliant data does not state it as a compressed load.
So @rambo-6mmrem is 100% correct: tread carefully.
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