As has been noted, 100 yards is out of (ethical) range for either.
Quote:
Originally Posted by speedracing944
I agree a 223 would be a good choice as it is one of the better varmint rounds out there.
How about a AR15 with 223 and scope? I might have justification to buy one now 
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Even without a scope. Either way, 223 would do the job just fine.
Check your local laws though.