I had a S14 41 Mag for a while. I never got it grouping as good as yours so I bought a 10"er and sold the S14 since I like shorter barrels anyway. They both would shoot minute of deer, but neither grouped great until I switched to Win 296 powder at 20 grs, which is just about exactly what you are using. It will now shoot them kind of groups.
As far as hunting deer, I shot 2 within a minute one day with the S14. One fell in its tracks and the other took about 2 steps and I missed the third. I know, I probably should not have shot the whole family, but my family loves to eat deer.
In my opinion they are a great deer gun. Don't sell it unless you are sure you do not want it because they are hard to find, the S14's are rarer than the 10"ers.