The 300-character limit is set by LinkedIn. While sending out a connection request, LinkedIn allows you to write a note with a 300-character limit, so this LinkedIn outreach works for the same.
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Example:

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Exploring the Reasoning Behind the 300-Character Limit in LinkedIn Outreach Messages
The 300-character limit is set by LinkedIn. While sending out a connection request, LinkedIn allows you to write a note with a 300-character limit, so this LinkedIn outreach works for the same.
Example: