Mmm... if you consider a 6.5 hole to big what about a 338 300grSMK at 3150fps, a few years back I took my old 45 pound 338-416imp out on rodents it certainly was up to the job on those looong shot
Back to the subject a 6.5 sweed could work but it would need to be accurate and in a good modern bolt action and in the right twist rate for the bullet intended for the job, then add a quality dial up scope and the bunnies better watch out.
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