While I agree with some of what you wrote, I disagree with some as well.
For starters, the 6.5 Creedmore falls short to a well loaded .270 Win...
Not even close. The .270 fails out of the gate due to the only SD > 0.3 bullets having to be intentionally blunted to achieve stability. The BCs suck. It's crippled as a big game rifle.
Call me when there's an equivalent of the 160gr .264 Weldcore that'll stabilize in a 1:10" .270
Of course, you won't be calling because it's not physically possible to make that bullet due to the twist rate mistake made during the .270s initial design.
In the mean time I'll be shooting the superior Creedmoor and laughing at .270 losers
And it's spelled
Creedmoor. Like the range.
A comparison of Hornady factory 6.5CM/143g ELD-X @2700fps (S.D. .293, B.C. .625) and .270 Win/145g ELD-X @ 2970fps (S.D. .270, B.C. .536) ammunition shows the fallacy of your claims.
At the muzzle (Hornady data):
2700fps = 6.5CM
2315fpe = 6.5CM
2970fps = .270W
2840fpe = .270W (23% greater than the 6.5CM)
At 600 yards, assuming a Point Blank Range zero for a 6” diameter target at 7000 feet (we hunt there and higher), the comparison is as follows.
6.5 Creedmoor
237yds = zero
280yds = -3” drop (PBR)
-64.5” = drop @ 600yds
2064fps @600yds
1353fpe @600yds
16.9” drift @ 600yds (0.9” better than the .270 Win)
490yds = 2173fps/1500fpe
.270 Winchester
256yds = zero
302yds = -3” drop (PBR)
-53.1” = drop @ 600yds (11.4” less than the 6.5CM)
2177fps @ 600yds
1526fpe @ 600yds (13% more than the 6.5CM)
17.8” drift @ 600yds
630yds = 2158fps/1500fpe (29% greater than the 6.5CM)
Using 2000fps and 1500fpe as the criteria (which I use as a rule of thumb for elk), the .270W has 140 yards or 29% greater range than the 6.5CM. That extra range means a hunter can cover 65% more area whether you are looking at a full circle or any angular segment. When you are sitting on a clearing or hunting elk in open sage, as we often do (and plan to do again this year), that extra range many not be necessary, or it may, but in either case it is nice to have.
If you think you are killing elk (our purpose) with B.C. or S.D., well, that's just nuts. If you are killing them with retained velocity, momentum and energy, the .270 Win provides more at ranges we are concerned about.
Just sayin’.
