Thanks for this additional info, gentlemen. All very much appreciated.

ChrisPer and kamilaroi, are your M-1910s rifles or carbines? Mine is a rifle. This would account for at least 100 fps difference in MV, maybe more. I know my friend here in Darwin, Brian D_, can't get 2000 fps out of his 9.5 carbine, and likewise I cannot reach 2000 fps in my little 6.5 with 160gr RNs either.

Regarding the Hornady 270gr RN, I have noticed that the bullets I'm loading have a bunch of barely-visible parallel 'fractures' around the ogive, which would obviously help them open up quickly. In Elmer's day, that bullet may have been a horse of a different colour.

...and I loaded another 10 last night, up to 47gr AR2206 this time. I'll keep you posted...