Concrete post base wood too tight

anchorconcretepostpressure-treated

I'm using the Simpson PB66Z "Galvanized Post Base" to attach my pressure treated 6×6 to the footing. The wood seems to be slightly too large to fit such that the bottom of the post rests on the metal.

What's the proper way to handle this? I could pound it with a sledge hammer, shave some wood off on the two side corners, or something else? What is commonly done?

Edit: Added picture of the issue.
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Best Answer

To follow up, I did use a sledge hammer to pound them into place. I placed a small cut piece of the 6x6 on top to prevent the post from getting messed up. It wedged it in there quite well.

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