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280cc kit help

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Hi guys, I have some questions for you guys. First of all a have a 1997 XR250R, and a decide to put the 280cc kit on it. I bougth a Wiseco 77mm piston and I rebore and hone the cylinder with thumper-racing people. My first question is: Which is the exact bore of the cylinder after rebore? is 77mm exacts?. I ask because I think that the piston feels loose inside the cylinder, I know that between the cylinder and the piston should be a gap (0.05mm).

For all the 77mm pistons, the machine shop rebore the cylinder at the same diameter?

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