Is there a sportsmans warehouse in your area? The one in my area has been happy to help me by opening holster packages and try my gun in the holsters.
If you do this, bring your gun into the store unloaded and in a gun rag or box. Take it to customer service and tell them what you need. Don't just walk into the store and pull your gun in the holster department.
Most gun stores are happy to help you. Just be sure not to scare the other customers or the staff.
Romans 1:16 I am not ashamed of the gospel, because it is the power of God for the salvation of everyone who believes: first for the Jew, then for the Gentile.