Do not worry Grasshopper, I shall guide you, First lets say your wild cat is a 6.5-06 and you want to shoot 120s, you look at a 270 same parent case and a 25-06 also same parent case, and compare powders and volume, for the 270 In H4350 and a 120gr starting load, is 51gr and max is 55g, and for the 25-06 and H4350 and a 120gr starting load is, 44gr and max is 47gr, so if min on the 270 is 51gr and max on the 25-06 is 47gr, that means 49gr is a safe place to start, if you are going down in bore use the min of the bigger bore, and if you are increasing the bore size you can use the max of the smaller bore.
Dean
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