I'm happy that the barrel that I sold you is doing well. Dead-center primer hits are not common in my experience, even in bolt action guns. As quickdtoo said "As long as it goes bang consistently, don't be concerned."
I use 13.0 gr of Lil' Gun with the 40 gr. V max with good results in both of my Hornets, a Topper and a Contender carbine.
Good shooting!