I'll echo what Texas by God stated - the fix for this on a SA for eons was to slightly bend the front sight in the direction needed to correct the windage.Before doing it though - the suggestion to work on your grind use the chart is what you should try before getting the small crescent wrench out. If the NV is new to you - it may be a matter grip hold adjustment? I had a NV in 357 - 5 1/2" - I have shot single action for 50 some years - mainly C # With much worse sights than the NV. I had the same issue you are having and finally changed the grips out to a set of Eagle "gun fighter grips" that I bought off a guy to try - those combined with my hand size and some work on my hold got me shooting straight - it was me and not the revolver. I've since sold the NV and have a Uberti 4 3/4" 357 Bisley - a much better "fit" for me and accurate right out of the box - so I was lucky. I then went with a Uberti Cattleman - 7 1/2" 45 Colt. That as well shot very accurately for me but has a whole different "feel" to me than a NV has.
Another thing - don't know what your shooting - but check your throats - my NV was born with very tight throats (all I shoot is cast) and they didn't all match each other. If you have an issue with your throats - get with DougGuy - he's well known for taking care of that problem and does excellent work from all reports.