If you own a modern rifle chambered in 6.5x55 such as a Rem 700 or a Win Mod 70 or a Tikka T3 etc, and you hand load to equal pressures wth equal bullet weights, say 160grn 6.5 at 55,000 psi and 165grn 308 at 55,000 psi, there should be little or no difference in felt recoil, assumeing that rifle weights and barrel lengths are equal. The 6.5x55 is noted as a light kicker just as the 7x57 also has the same reputation and for the same reason, lots of military surplus as well as weak actions around from the turn of the century that won't take a steady diet of the higher pressures generated by the 308win round. Factory ammunition is loaded in deference to the weaker actions of yesteryear for the 6.5x55 and for the 308win is loaded to the much higher pressures allowed by the stronger actions of today. The laws of physics dictate this, e=mc2, for every action there is an equal and opposite reaction. bearhunter