water tightness 308 Lapua test

I loaded a three times fired Lapua 308 case, in my M1A, Springfield, rifle last night. Along with other dirty emptys, I placed it in the sink, soap and hot water covering all, left it overnight, this morning I pulled the bullet and powder from the round, finding powder dry and excellent to the match firing test, and I then fired the primer in the gun, and found to my surprise, it blasted full force when triggered. I guess this shows that the Varget is good, and the CCI primers are good, and the cases, which are Lapua 308, are really tight and well designed.