Run the 277 140 NAB vs the 280AI 160 AB and see what all the fuss is....
I did just for fun, only ran it to 600 yards though. I picked 600 yards because that is going to be beyond the range that the majority of game will be taken by most hunters. Honestly, I knew the .280 AI was going to win.
.270 Win 140 grain Accubond MV 3018 FPS per Nosler data.
JBM Ballistic Data set at 4000 ft elevation, 40 degree temp.
MPBR 370 yds 1788 ft-lbs energy.
600 yds, -11.1 MOA drop, 3.6 MOA wind, 2051 FPS, 1308 ft-lbs energy.
.280 AI 160 grain Accubond MV 3045 FPS per Nosler Data.
JBM Ballistic Data set at 4000 ft elevation, 40 degree temp.
MPBR 375 yds 2137 ft-lbs energy.
600 yds, -10.6 MOA drop, 3.3 MOA wind, 2130 FPS, 1612 ft-lbs energy.
.280 AI MPBR +5 yds, +349 ft-lbs energy.
.280 AI @ 600 yds, +0.5 MOA drop (3.141"), -0.3 MOA wind (1.8846"), +79 FPS, +304 ft-lbs energy (not +204 as I previously posted).
While the .280 AI wins on paper, I can't hold less than 2" of wind at 600 yards and I'm pretty sure what ever I hit at that range can't tell the difference of 204 ft-lbs energy. While I said I wanted a 1:8 twist .270, there isn't anything I couldn't do with the standard 1:10 twist.
