Eh, plenty of data for .25-20. For 75 grain bullets, top .25-20 loads are:
AA-1680 12.5
H4198 12.8
5744 11.2
H4227 9.3
H322 13.5
For 86 grain bullet:
H4198 11.5
H4227 8.6 grains
H322 12 grains
2400 8.8 grains
Any of those would be a safe starting load in your wildcat since it has more case capacity and will take much more pressure than .25-20 specs.
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