My comfort zone is around 3300 fps. More may be possible but with no tested data that is good enough for me. Work slowly up towards 65 grains watching for velocity spikes. 65 may be too hot I have no way of testing. My rule of thumb is about 1-1.5 grains more than max for MRP in medium cases.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli