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Just making sure.... Will a 180 gr. JHP achieve the same PF as a 180 gr. FMJ RN with the same amount of powder? Or, will the bullet shape/cavity require some load tinkering? If so, up or down?
 

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There probably is no universal answer to that question. It depends on the bearing surface differences of the bullets, the overall length of the loaded cartridges and the distance the bullets jump before they engage the rifling. Any differences may make some change in velocity/pressure between the two loads. The difference may or MAY not be all that great, but I'm guessing there would be SOME.
 
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