Oh yeah, not questioning the lethality of the load one bit CH. I have used a 270 quite alot and love it. I just can't make the inputs come up with the same numbers you came up with.
Even at 7000 feet with the numbersI got using the Litz B.C.?
I got pretty close to your numbers. I don't know what you used for atmospherics, but I normalize barametric pressure for altitude, and that has worked for me out to 600 with many, many bullets in a few cartridges including the 270 with the 150 ABLR. I used 30 degrees and 50% humidity. I get 1498 ft/lbs and 2121 at 750 using the Litz BC. I shoot usually around 4000-4500 ASL, and hunt 5500-6500 ASL. I use 6000 and 10 degrees with average humidity 50% when I run charts for hunting. Has worked well for me.
