http://www.shooterscalculator.com/recoil-calculator.php

https://www.hornady.com/team-hornady...alculators/#!/

https://www.hornady.com/bullets/rifle/#!/
lots of guys fall for the marketing on the NEWEST AND LATEST, being the best,
the marketing departments of most rifle vendors would have you think theres huge, improvements being made almost every year,
the truth here is that the nearly 100 year old 270 win is still very competitive,
with the newer calibers if correctly selected hand-loads with the newer powder and projectiles are used.
your more than likely debating a difference in recoil energy between about 16 ft lbs and 21 ft lbs depending on the ammo and rifle weight
even the higher energy 270 which gives you a significant advantage in range and power
with the higher recoil is a ridiculously low recoil rifle even my 12 year old grandson easily handles
don,t get the idea the 6.5 mm shoots significantly flatter than the 270,
if each cartridge has good hand loads and keep in mind easily 80% of all game is shot at well under 300 yards
within reasonable limits its not the rifle or caliber used that matter nearly as much,
as the skill , persistence and experience of the guy using it.

reload data

http://www.handloads.com/loaddata/default.asp?Caliber=270%20Winchester&Weight=All&ty pe=rifle&Order=Powder&Source=
figure 3000 fps 140 grain

http://www.handloads.com/loaddata/default.asp?Caliber=7%20mm-08%20Remington&Weight=All&type=rifle&Order=Powder& Source=
figure 2800 fps 140 grain

http://bulletin.accurateshooter.com/...pular-powders/
figure 2700 fps 140 grain