sentences:  regulated countries are currently (2013) proof tested at PE piezo pressure.The .300 Lapua Magnum has a very high maximum allowed chamber pressure level and indicates that the cases of the .300 and .338 Lapua Magnum are built extremely sturdy.The large boltface combined with the high 440 MPa maximum pressure makes that the .300 Lapua Magnum should only be chambered in rifles that are capable of handling such large and fierce cartridges and thus high bolt thrust safely.