I have mixed feelings on this. I currently have a 10" with a match chamber and just bought it from Ed before they were no longer available. My best group size at 50 yards is 5 shots touching, whatever that measures out to. It will shot these groups with RWS High Velocity or CCI Mini Mags.
Reason I say I have mixed feelings is because I bought a 10" because I like the lighter weight in the 22lr. I plan to use it for squirrels which I think the ligher weight from rests in the woods will be better. However, if shooting from a bench, it is not near as steady as my 14" HMR barrel. That 17 barrel just sits there rock steady. However they both shoot similiar groups, so maybe the difference is not as much as it seems. Overall I think the 10" is better for me. The 14" would not be that much ligher than my 14" 17 HMR and that thing is a beast to hold and shoot offhand.
One other note to this lenghty post, I had a 10" 22lr years ago that was not a match chamber. Unless that was just by chance not a good barrel, the match chamber will shoot circles around it anyday.