RB - is wonder lube the same as bore butter or are they of totally different composition?
The reason I ask, is that if the liquid wonder lube is merely a liquid form of bore butter (chemically) it is a product I would not use.
On the surface, it does sound terrific though, due to your cold weather, ie: freezer testing.
It then, is similar to Neetsfoot oil in that regard.
Taylor used neetsfoot oil all last winter as a lube in his .40 Kuntz rifle on our trail walks, most every Sunday - temps to minus 10 - and the 80th shot (with no wiping) loaded more easily than the 1st. I've had the same results with Mink oil, neither of which freeze solid like so many other 'lubes' when temps dip below freezing. Accuracy seems as good as with water based, but as always, check poi as that CAN change when switching lubes. Many rifles shoot a bit lower with an oil or grease lube, whicl some shoot higher.
Many rifles demand about 10gr. MORE powder to maintain accuracy, ie; grouping ability, whcih switchign to an oil or grease from a water based lube. Accuracy must remain good so you know the exact impact location of the ball according to your sight picture at the rifle's discharge. You owe that to the animal you are shooting.