Why buy a .270? For Daughter #1 it came down to this:
1. An unwanted rifle that needed to be sold or traded.
2. A desire for a little longer reach than her .308 Win could provide without a lot more recoil
3. Opportunity

She has used her .308 Win effectively for antelope out to 350 yards plus (forget the exact range) with a 130g TTSX @ 3045fps. Using 2000fps and 1500fpe as a rule of thumb for elk, that load fell short past around 395 yards, even at 7000 feet altitude. Since she practices out to 600 and we hunt elk in open country where ranges can long, we both wanted something for her that had more range. The .270 Win with a 150g LRAB came up as a possibility. When I found a good used Remington M700 I could trade the unwanted rifle for, it was a done deal. Her .308 tops out at 2744fps with a 165g bullet and a max dose of Varget. I was pretty sure I could push a 150g in a .270 Win to 2850fps or more. Turns out I was correct - her .270 Win pushes a 150g LRAB to 2912fps.

What does that do for ballistics? Here's a comparison using a .270 with a 129g LRX @ 3100fps compared to Daughters .308 and a 130g TTSX @ 3045fps. The results assume 7000ft altitude and MPBR zero for a 6" target

.270/127g LRX @ 3100fps (est.) vs .308/130g TTSX @ 3025fps (actual)
Zero = 266yds vs 256yds
MPBR = 313yds vs 301yds
1500fpe = 550yds vs 395yds
2000fps = 770yds vs 555yds
Drop @600 = -48.0" vs -57.4"
FPS @600 = 2220 vs 1929
FPE @600 = 1412 vs 1074
Drift @600 = 18.7" vs 26.7"

Here's another comparison based on 7000 feet altitude, MPBR zero for a 6" diameter target, This comparison uses actual velocities for her 22" .270/150g LRAB and Nosler's 168g .308 LRAB factory load and a 24" barrel:

.270/150 LRAB @ 2912fps @ 2912fps (chrono'd) vs .308/168g LRAB @ 2750fps (Nosler claim for their ammo)
Zero = 254yds vs 241yds
MPBR = 300yds vs 284yds
1500fpe = 710yds vs 615yds
2000fps = 835yds vs 620yds
Drop @600 = 52.5" vs -63.7"
FPS @600 = 2236 vs 2022
FPE @600 = 1665 vs 1525
Drift @600 = 15.5" vs 19.3"

Recoil calculations showed all loads above came in under 18 ft-lbs.

Last edited by Coyote_Hunter; 09/03/19. Reason: spelnig
Coyote Hunter - NRA Patriot Life, NRA Whittington Center Life, GOA, DAD - and I VOTE!

No, I'm not a Ruger bigot - just an unabashed fan of their revolvers, M77's and #1's.

A good .30-06 is a 99% solution.