Hogdon website has listed loads for many calibers and combinations, but I don't recall or see where they stipulate a "max load". However, for 54 caliber the heavist load listed is with 2F at 120 grains.
My 54 caliber Hawken with 1 in 66 begins to loose accuracy at 110 grains of T7 2F and is best at 100 grains.
Same deal on both my 50 and 54 1:48's. Good accuracy with virtually any load, up to 100. That said, I find the 54 more forgiving. More consistent, load to load. When you hit the bad point, on the 50's, the result is worse, than when you do that with the 54's.
