the 115 grain Speer hollowpoint in 270 had (discontinued) a s**tty BC of a bottlecap, not a fair comparison
Lets compare a more apples to apples bullet, the 110 grain 25 cal Accubond and the 277" 130 gr Accubond. Both have similar sectional densities, and both would be excellent choices in the respective cartridges for open country deer hunting
25-06 110 gr Nosler AB @ 3150 fps
+/- 3" PBR ~ 309y...263y zero
100 +2.5"/ 2935 fs / 2100 ftlbs /
200 +2.4"/ 2725 fs / 1815 ftlbs / 2.5" drift (10mph)
300 -2.4"/ 2525 fs / 1560 ftlbs / 5.9" drift
400 -12.6"/ 2340 fs / 1335 ftlbs / 10.9" drift
500 -29.2"/ 2155 fs / 1135 ftlbs / 17.6" drift
270 130 gr Nosler AB @ 3060 fps
+/- 3" PBR ~ 302y...257y zero
100 +2.5"/ 2855 fs / 2350 ftlbs /
200 +2.3"/ 2660 fs / 2040 ftlbs / 2.5" drift (10mph)
300 -2.9"/ 2470 fs / 1765 ftlbs / 5.9" drift
400 -13.7"/ 2290 fs / 1515 ftlbs / 10.8" drift
500 -31.2"/ 2120 fs / 1295 ftlbs / 17.5" drift
So they stack up pretty close. The 270 does have an energy edge due to the heavier bullet, but I dont think any deer inside a 1/4 mile would notice the difference assuming the bullet lands in a spot where it should. Less than 20% more recoil in comparable weight rifles.
Basically it boils down to if you're going to be using this deer rifle occasionally for coyotes...or occasionally for elk and moose