aalf - your right, I used a conservative number. According to Nosler's 6th Edition reloading manual, the fastest they have a 140 gr bullet going is 2953 from a 26" barrel. So I'm about 100 fps slower in my comparison chart. With 2953 fps, I'm sure the performance with the 6.5 would be that much better.
The main differences I'm seeing is the wind drift at extremely long ranges. The 6.5 certainly has the distinct edge on the .270 but the trajectory between the two is almost the same. Here are the numbers at 1000 yards using the data I initially used above.
.270 Win @ 1000 yards
drop -274.2"
wind drift (10mph) 86.3"
557 ft lb energy
6.5-284 @ 1000 yard
drop -273.6"
wind drift (10mph) 66.3"
752 ft lb energy
I'm not trying to suggest the .270 win is "better" than the 6.5-284 - it's not. I'm just trying to compare the two based on factual numbers to see where the real advantages are. I intend on bulding a 6.5-284 (or .264 win mag) in the near future. Nonetheless, the old .270 win, seems to be quite good out to fairly long distances.
Last edited by Curtis1911; 09/26/10.
