The last Winchester loading data booklet, published by Winchester, shows 18.5 grains of 296 for the 125 grain JHP and 16.6 grains of 296 for a 158 grain JHP. The data says to use magnum primers and a very stiff crimp. It also says to never reduce the charge with 296 from the data shown as it does not react well to low density loadings.
I have used the 125 grain loading a lot.
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