@Frosty861, is we substitute Automatic Transmission Fluid (synthetic sperm whale oil) or Power Steering Fluid in the Ned Roberts recipe using sperm whale oil, you've found all the instructions in Ned's book. I won't tell that it's petroleum based.
Naturally we need to know what the intended purpose is for the "Moose Milk". A cleaning solution version will be different than the patch lubricating solution. Is
@BlackRock52 planning to spend a day at the range or going hunting? Is the Moose Milk to be used for cleaning? Potentially three different solutions.
At the range, the mix of 4 to 7 parts of water to one part of the water soluble oil will keep the fouling soft and the water in the patch in the solution is used to dampen the patch for the ball. Mights be able to get quite a few rounds off without excessive cleaning.
While hunting you will want little to no water with the oil. If used to wipe the bore after a shot, the 50/50 mix is good.
For cleaning, then much more water (10 to 15 parts of water) which would be good for removing black powder fouling. One part of the water soluble oil to loosen grease. One part of a soap, maybe Murphy's Oil soap, dish washing soap or ??? to act as a surfactant to remove crusty oils and grease.
I guess in my opinion, there is not any one "Moose Milk" formula that qualifies as the best one.