The Speer number 11 manual lists 28.5 gr as max for a 55 gr bullet with Win 748.
I have been loading 27 gr of Win 748 under 55 grain bullets, mostly Remington, Hornady winchester SP for the last 20 or so years and shoot them out of a Remington 700 VLS and a TC contender with a Bullberry 21 incher, never have had any signs of pressure, with 1/2 inch or less groups from both rifles.
This works for me, your guns may be different, pull them down, reduce the charge and try them out.
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