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OMGitsOMG Yes, that will raise the cap to 250 for just Explorers.
In ExpTable, anything > 200 will return Integer.MAX_VALUE. It is a check because the array size only fits levels 1->200. You can add more, but can't go anything higher than Integer.MAX_VALUE (2147483647) as the highest exp gain possible is of integer in v83, unless you modify it entirely in the client or update to v150+ when they changed it to long. Also, i'm pretty sure client-sided NEXTLEVEL::NEXTLEVEL exp calculations checks > 250 return INT_MAX, (2147483647), so again you can't do anything about it. However, you may be able to make it able to reach up to 255, but even if you modified the client to do so, exp would either be < 2147483647 or JUST 2147483647.
Now a workaround would be to add 2147483647 + exp and get a percent out of the total required. Server-sided you could make a @exp or something to check the EXACT exp required for the level.
tl;dr you can't go higher than 2147483647 exp without major client editing, but you can with server-sided checks and incorrect visual display by use of commands to show the real percentage.
Also, this is a release thread and I suggest creating help threads for such questions to avoid off-topic posts related to the release.