Technically you are supposed to go to the higher weight. If its within .1 or .2 oz, I go with the lower. At .3, I don't take the chance (however slim it may be).
So far I have not had any issues.
I'm building a 1968 and a 1970 Topps set. I have lots of 1970s and 1960s to offer in trade.
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So far I have not had any issues.