Well I had plans to test 5 different loads today, but was interrupted by some much needed rain.
A couple weeks ago I tested a load on brass that had been fired 14 times. That 3 shot test shot an impressive .354. I knew I was getting close to the end of that brass life, but wanted to test a 12 shot group with that same load to get a good batch of data. The first 8 shots were all over the place. Then I split a case on the 9th shot so I called it quits.
Fast forward to today. First three shot group with brand new unfired brass, same load as the .354 group from a couple weeks ago, shot .451
I was able to test just one more load before the rain started. Same seating depth, but .010g less powder. This is brand new load so I don't have anything to compare it to. Shot a decent .555.
Now I know 3 shots represent a very small sample of how brand new brass performs against fire formed brass, but it's a start anyway.