I cracked the three front lugs on a range rifle that was built and proofed for 144gn NATO. There was no deformation to the cases. The load was showing no pressure signs on the cases or primers. I was using 175gn projectiles in a load the Data sheets showed was not near max. The rifle was not made to use that load. The L42a1 was not designed or built for 308 loads The 144gn NATO is in the upper ends of its safety. 168gn are over the top 175gn is well over the top. I have a L42a1 I reload and use a load similar in pressure to lower than the 144gn NATO to preserve a collectable rifle.