based on your results and using the greenhill formula (T=150(D/R))

D = .284
R = L/.284 = 1.525/.284 = 5.37
1.415/.284 = 4.98

T(berger) = 150(.284/5.37) = 7.93

T(Amax) = 150(.284/4.98) = 8.55

So take this for what it's worth.. just a formula but makes me think about the next barrel I order.. Seems 1:9 may not be the best for these high BC bullets