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Hmmm - H4831 and H4831 SC responds well to use of a dropper tube or vibration of the case, 54gn (MAX LOAD) is 108% fill which might be achievable depending on your seating depth, it should give...

ihmsakiwi - you should get about 2900 fps at 54gn. Again a Max load so approach with caution.

Gidday - assuming 162's at factory COL from a 20" barrel Quickload says you should be able to run up to about 56 gns (MAX) of RL26 and get about 100 fps than RL17. Make sure you work up to this...