No, not to be combative. That's just an old wives tale.12x or even 10x is plenty for 30 yards. You won't see much difference , if any and you might do worse at 24x. I have many 1 tiny woodpecker hole groupings at these ranges and never went over 12x at these short ranges.Using less magnification does not make it impossible to shoot small groups at short range or well on 30 yard challenge targets but it makes it more difficult. If you examine the spreadsheet of results you will find a few very good targets with lower power scopes but most of us are using 24X or more. It just improves our chances of a good target.
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