Western shooting activities are all so different and to perform at a higher level for each one, different gear and training techniques are required. The proper use of a clip-less gun holster is to shoot while mounted from a horse. The clip-less holster is reminiscent of the western era since there is no latch to hold the weapon tightly or securely.
Newer holster designs are made for semi-auto guns that are shorter than traditional revolvers. Traditional revolvers are long and have more weight in the barrel which adds to its tendency to remain well seated in a holster. This design feature allows the holster to be designed without a clip. Removing the revolver from the holster, firing and then returning it to the holster while riding is then much easier and allows for less danger or risk of dropping the weapon.
This is not the only to feature required in a holster in order to shoot while mounted. The design of the holster can either be open or formed. This means that the holster can be fitted exactly to the gun or it can fit the gun loosely. A fitted holster will not allow for easy removal of the weapon while riding while a loose fit holster will allow it to be pulled out and forward without any snags or hang-ups.
How the holster fastens to the belt is important too. This may not work the way that you think it would. For the belt fitting you want it to be very snug. This is the opposite of how the holster should fit the gun. gun case that the belt fit should be firm is so that when the gun is pulled from the holster it does not follow it and cause a snag or hang-up prior to the barrel leaving the holster. This could cause the rider to drop the gun or even lose his or her balance and possibly fall.
The seams of the holster are important too. Traditional western holsters are fastened with brass brads. This may be traditional but the variations in the seams will cause the sight of the gun to slide unevenly out of the holster. The best seams are a double stitched or in some cases glued. This creates a smooth gutter for the sight of the gun to slide in as it is being removed and replaced.
The proper holster to be used while riding mounted on a horse is a clip-less, loose fitted and sewn holster.