Reloadingtips.com

 
 

 

Address
web@loansoftware.com

 

 
 
 


Lead fouling on cleaning patch

 What is Zero, Minimal, Severe,

Etc. Leading?



 

Occasionally loads are described here as producing ZERO leading or moderate, or severe leading. Those descriptions will mean different things to different people.

This page will illustrate what those terms mean when they are used on this site.

First of all, a description of ZERO, moderate, severe, etc leading will be qualified to a single firearm. A load that produces zero leading in one gun may turn another gun's bore into a sewer pipe.

 

Photo instructions:  Expand images with the control key plus the mouse wheel or maximize them by click on them. They will open in a new window at the maximum resolution. Control + Wheel Forward zooms in. Control + Wheel back zooms out.

 

This is a moderately leaded Thompson Contender .357 Magnum barrel.  

The image was taken after a shooting session but before any cleaning implement was used in the bore. The bore is full of powder and lubricant residue. This residue makes the leading very hard to see.

If you can see the leading in a bore before cleaning out the powder and carbon fouling, it is really bad.

 
Leading Dirty Bore

Leading usually begins in the sharp corners at the bottom of the grooves. This the very first stage, the earliest stage of leading. Notice how small and innocent it looks at the beginning. This image illustrates the importance of cleaning out the carbon and powder fouling before looking for lead.

Two areas of leading are marked in red in this image. You must expand the image to see the markings. To open the image full size in a new window, simply click on it.

 Leading Beginning in the Corners of the Grooves
   

This image shows the bore with minimal leading. Leading is visible if you look for it but it is not severe enough to be noticeable or to have any effect on the accuracy.

Three areas of leading are marked in red in this image. You must expand the image to see the markings. To open the image full size in a new window, simply click on it.

Note in particular the two small strips of leading inn the corner of the rifling groove. This is where leading usually starts but not always. If there is a rough spot or a tool mark, it will likely start there.

Also note the forcing cone. In this chamber it is quite rough and tends to be the first area to pick up leading. There is also leading beginning to accumulate in the lead ( The beginning of the rifling ridges.)

 Minimal Leading

Now the leading is beginning to accumulate. It is everywhere, in the corners, in the bottom of the grooves and on the tops of the lands. At this point things will begin go deteriorate rapidly.

I consider this moderate leading. It will not noticeably affect accuracy at this stage but it will agressively grab more lead and will expand quickly in both thickness and extent.

NOTE:  This is the exact same barrel as in the first image at the top of the page. This is what the fouling was hiding. This shows why you need to clean before checking for lead.

 Moderate  Leading
   
   
   
 


 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

home | products | about use-mail


 
 

Right 1
Right 2


Right 3