I have a bunch of Perfecta ammo in 308 win that came with a147 gr fmj bullet. Is there a problem pulling those and replacing with the Speer 130 gr flatnose intended for the 30-30? I would want to also reload it with the same powder minus 2 or 3 gr less to lower the velocity. This would be for my smaller framed grandson in a Ruger American rifle.

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Dad:son you have 2 choices for supper eat or don't eat.