If the .270 with 150 LRAB can generate 2900fps, does anyone have the numbers for a .280 gunning 150 LRAB with .652 BC. Velocity, drift, drop.
CLB: The BC for the 150 7mm ABLR is.611, not .652.
Nosler shows a top velocity for a 150 from a 280 as 2995 from a 26" barrel,so that's what I gave it(giving the 280 a deliberate advantage). It shows a top velocity for the 150 gr 270 bullet as 2913 from a 24" barrel,so I gave it 2900.
The 284 bullet also has a bit more base area for gas to work on than the 270 so you will likely see a skosh more velocity.
According to the Hornady Ballistics lab the 280 shades the 270 at 600 yards by 60 fps;by 3.9" in drop; by 4/10ths inch in wind drift; and by 85 ft lbs in energy.
If you start them both at 2900 fps,the equation changes in favor of the 270 by the same fractional margins.It wins at 950 yards; if you want to call 3" less drop,a 2" advantage in wind drift,and 25 ft lbs in energy as "winning" LOL!
Pretty excruciating stuff and almost impossible to prove in the field with a rifle in your hands.
Yeah you can go to the heavier 7mm bullets in the 280 with higher BC's but you can't start them as fast. So it's still a horse race by a nose.
