Still a 3rd group is meaningless.
You did not have a valid sample size for either of the rounds.
Years ago I shot 40gr Federal Blitz, 55gr M193, IVI C77 and Federal 69gr from a 4 barrels
14.5 1:9 BM
14.5 1:7 Diemaco
20" 1:9 BM
20" 1:7 Colt
At 100m the 40gr federal Blitz shot best from the 20" Colt, the rounds blew apart in the 14.5" Diemaco, the 'conventional wisdom" was that the rounds where overstabilized in the 1:7 and could not handle the rotational forces.
What really was happening is the rifling of the Diemaco barrel was sharper and the bullet jacket (as thin as it is) was basically being prefragmented at the pressures in that barrel, yet the duller rifling of the Colt was not causing as much strain even though velocities where much higher.
We have a 14.5" Diemaco pencil barrel here at work, and its a submoa gun with 52gr Match, 55gr Match and several other match rounds.
All rifle barrels are not created equally is the best lesson to learn.
