depends on the gun.
a 223 out of a precision varmint type 24" rifle will be more accurate and hit harder than a 308 out of a 1.5" short barreled rifle...
while on the other hand a precision varmint type 24" barrel 308 will be more accurate and hit harder than a 223 out of a 1.5" short barreled rifle...
the truth doth lay somewhere in the middle
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent