This part was fun. The rifle was proofed a .303 british.

1) I found the max pressure load for a .303 [43,800 CUP], this would be my max pressure.

2) As there is no load data for the 35WCF I went off the 35 whelan as the case capacity is identical [70 grains]

3) I found the lowest pessure 35 whelan load [42,300 CUP], then reduced it 10%

This worked out to 50g of Varget sitting on a 200 grain Siera RN.

I have used Varget in each of my DRs with good results.