I have tried a ghost ring on my 454 SRH. Its quite fast but for me its not great for accuracy. I believe this varies a lot from individual to individual. The only way you'll know is try one.

I also have a Burris Fastfire 3 mounted on the SRH. Delivers good accuracy out to about 125 meters (probably more with a better gun & shooter). Turn it on at the start of the day and switch it off when finished. Don't try only switching it on just before the shot, the game will move off before you can take your shot.

Two downsides:

I find it much slower to line up (ie finding the dot problem) than iron sights.

The Fastfire 3 has a auto turn off after about 8 hours. Once you know about it you can accommodate the issue by turning it off then on half way through the day.