Manufactor load data VS. pressure simulation

So I was going to make a 308 load, but given prior loads overpressure problem I thought a pressure simulation would be a great help. But know I'm just more confused to say it at least.

Vihtavuoris load data says: Min 41,7 grains, COL 2,736"

And with that data its already overpressured (66692 psi) according to GRT

Projektile: Barnes TTSX 168 grains

Powder: Vihtavuori N540

Case: Lapua

What am I missing here? I would've thought that Vihtavuori' loaddata was safe

https://preview.redd.it/tduhcgipe4de1.jpg?width=1918&format=pjpg&auto=webp&s=70bf6e7efa6758ac8b86a0d42bd74e3d999a8b19