Some shooters seem to have the idea that when using Moly you don't have to clean your barrels much. That is wrong.
I have been using Moly for 6 or 7 years now and have never experienced any trouble with it. Moly works best when impact plating applied with steel shot in a tumbler. The spray on stuff applies too much and gunks up the barrel.
The system I use is was perfected by NECO, and it works perfect.
Many of the shortcut applications are just that and cause build up.
Regardless of Moly you need to remove the carbon from the bore and likely copper fouling. Moly works best in smooth bores.
To get Moly to impact plate properly on bullets they have to be free of any swaging lubricants. I shoot Bench Rest and use nothing but Moly coated bullets for that. I use it in all my hunting rifles, since I have all the materials and equipment.
I clean my barrel with a mix of Shooters Choice and Kroil. Swap first then
stroke with a brass brush swap again with solvent and then dry patch. This will not remove all the Moly. Before shooting again I use a brush wrapped with a patch and apply an oil/Moly mix to season the barrel again. The first fouling shot stays in the group using this method.
But cleaning you must, for heavy fouled bores and or rough bores the use of JB paste is recommended. Then season the bore again with the oil/Moly mix. It works, and it is not hear say.
Just finished breaking in a new Shilen 30BR barrel using 125gr Moly bullets, 15 rounds shoot and clean each round as above then a fouling shot, then the last four shots grouped into a bullet and a 1/2 or so?.
I don't think my new 25-06 H&R Ultra will do that good, but Moly it will shoot. Benefits are, less throat wear, easier cleaning, less pressure, more velocity, no trouble loading into the lands.
Se my Moly coating write up on my web site.
Fred M.