I have never been in the position of needing to reload for quick follow up shots but I am trying to imagine holding your gun in you left hand and retrieving a cartridge with your right hand out at that wrist carrier mounted on your left wrist. That would be, in my mind, a bit awkward. If I was in the need I believe I would want one of those that mount on the right side of the butt. It would be much easier to operate,,,,LK

https://image.sportsmansguide.com/adimgs/l/9/96761_ts.jpg