Create a new usergroup and give it permissions to access that forum and deny any user groups that you do not want to have access.
Set up a user promotion (Usergroups > Promotions) to move users with 250 posts to the new usergroup from the old usergroup.
Run the scheduled task "User Promotions" so that your existing members don't have to wait the hour for it to run.
That's it all done. Every hour vB will check the users and anyone with 250 posts will be moved into the new usergroup and therefore gain access to that forum.
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