Confederate artillery was always inferior to Union guns, unless they were captured Yankee ordnance. Even then, the quality of the ammunition left much to be desired. I think the Southern artillery had it's greatest moment at Chancellorsville firing down on Hookers headquarters, without Northern guns firing back.
On a related note, I think the South had a more practical organization for it's artillery. At Chancellorsville, the new battalion system was being given its trial run, and it worked to perfection. The realization that the artillery needed staff officers for field expediency gave the South an organizational advantage over the Northern artillery.
Just my 2 cents.

"I think it better to do right, even if we suffer in so doing, than to incur the reproach of our consciences and posterity."- R. E. Lee
"Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth. "- Geo. Washington
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