It depends on how you carry your 1911. Cocked and locked will require a vertical holster . All of the horizontal shoulder rigs I have seen require a strap to hold the gun in the holster and they are designed to cover the hammer. This means carrying with an empty chamber with the hammer down or with a loaded chamber with the hammer down.
I use to carry a Ruger security six ( 4" bbl. ) and my combat commander ( cocked and locked )in a Bianchi X-15 rig. No not at the same time.
Since I live in Illinois I used this holster while I was out in the fields and woods , hunting or any other time I was out walking in the woods , which was often.