Both rounds are amazingly accurate. In studying those who shoot 1000 yds in Competition they say that the 6.5×284 (6.5 Super) will beat the 6.5 Creedmoor hands down in speed. Speed is needed to improve crosswind bullseyes. The downside is that the 6.5×284 is a hotter bullet and will burn barrels at a much faster rate than the 6.5 Creedmoor. Not a huge downside if you have the funds for new barrels. Some research finds that Rich DeSimone, holder of the world record 1.564 inch 5 shot group at 1000 yards, says- he gave some opinion and tips. More in the Accurate Shooter article below.
- “Opinion – Rich suggests use moly-coated bullets to reduce friction and longer barrel life.”
- “Invest in a Hawkeye bore scope to ensure a really clean barrel and that you understand the throat condition.” says DeSimone
- Rich reloads and does his own machining.
http://www.accurateshooter.com/guns-of-week/gunweek050/
The upside is that at 1000 yards those that compete say the 6.5×284 is a winner.
Recoil and hunting – The 6.5 Creedmoor is easy on the shoulder, easy on barrels and can kill anything the 6.5×284 can at reasonable ranges.
Below is a chuckhawkes article comparison by Elevation of the 2 cartridges.
http://chuckhawks.com/compared_65-284_65creedmoor_F-Class.htm
Winning 1000 yd competitions requires that you can purchase and have a ready back up barrel.
Where the 6.5 Creedmoor shines is mid range like 600 yards, barrels live longer, less recoil, less powder.
From a Hunting standpoint the 6.5×284 delivers more energy at longer ranges but will always be a CXP3 round like the 6.5 Creedmoor.
Accordingly, if I was a 1000 yd Competitor choosing between the two cartridges, I would choose the 6.5x 284 and have a back up barrel. If a mid range competitor use the 6.5 Creedmoor. For hunting either will do the job but the Creedmoor has less recoil thus accuracy is often better due to less recoil.
Good Shooting!