I wonder how much solvent they used? And whether they used the same volume of the foaming bore cleaners in their liquid state? That would be an equivalent volume of solvent.
Seems that a test where you plunk a whole bullet into an unspecified volume of solvent is not very similar to what happens inside a rifle bore with a thin film of solvent contacting the bore.
There are billions of out of control variable in gun culture mythology, but focusing on that one for a moment...... I don't see an easy experiment. When you smear on the solvent, there are more variables than viscosity. And there is the weight of the smeared fluid. We don;t know how thick Copper fouling is. KG12 does not remove Copper as much as give Kroil or Witches Brew a crack to creep under.
A not perfect way would be to:
0) Clean the bullet of finger prints
1) Weigh the bullet
2) Smear the bullet with solvent.
3) Weigh the bullet with solvent and calculate smear wieight
4) Wait
5) rinse the bullet
6) dry the bullet
7) weigh the bullet.
8) plot different solvent's smear weights vs Copper loss
