Trinity85,
Everyone's talking about where you're pasting the string into, but I don't see where you're actually entering the string. If you're entering it into a text field, it'll limit it to 256 characters. If you're actually entering it into a memo field (where it's got to go if you plan on it going into a table) it should allow it.
The Missinglinq
There's ALWAYS more than one way to skin a cat!