If match 300 Win mag is compared to a 6,5-284 the following data occurs.
.338 'Lapua mag
250 grain sierra match bullet 3000 fps
1000 yards 297 inches drop
10 mph crosswind gives 64 " winddrift.
6,5-284
140 grains sierra match bullet, 2950 fps
1000 yards 310 inches drop.
10 mph crosswind gives 68" winddrift
300 win mag.
190 grains sierra match bullet 2950 fps
1000 yards 326inches drop
10 mph crosswind 77 inches drift
300 win mag
168 grains sierra match bullet 3120 fps
1000 yards 321 inches drop
10 mph crosswind 90 inches drift.
.308 win
168 grains sierra match bullet 2549 fps
1000 yards 524 inches drop
10 mph crosswind 125" winddrift
So I agree there is no such caliber as the best caliber, but in the comparision betwen the .30 cals, 6,5 and .338 the 30 cals is fairly far behid.
The 6,5 is impressive how such little amount of powder can archive so much.
But on the other hand the energy is not the most when it hits there far away, but that doesent matter on a paper target.
Regards Technika