Even at 15k psi chances are you arent going to hurt anything. There are a couple load developers out there that have never tested their loads and many people are using them. Thing is I know of several people that have had these loads pressure tested and they are upwards of 17k psi.

I'm not saying not to be careful but just know some of the loads many of us have been shooting have never been pressure tested even though the developer claims they have and there hasnt.been any issues yet.