Will Moly cause leading??

[dg101win]

To clarify this question--Will switching from Moly coated cast bullets to non-moly coated cast bullets cause leading if the moly coating in the bore is not cleaned out?
Up until this summer I was using cast bullets in my 44 Spl's and Mag's.

S47B,Lipseys 44Spl,50th Anniversary Flattop,and S&W 624. Leading was not a problem using 240-250 cast bullets with Unique. Also they all shot great.

A friend gave me some cast 240RN's that he moly coated,brand unknown. So I loaded them up and started shooting them and they shot pretty good. Then I switched back to NON MOLY coated bullets and got leading. After 20 rounds I get severe leading in the first 1-2 inches of the barrel. Also acuracy went south real fast. I got out the chore boy and the Lewis lead removal tool and cleaned out the lead. Followed this up with Kroil,CorrosionX and M-Pro7.

Went back to the range and the same thing happened. Much more of this and I can sell the strips of lead the chore boy cleans out.
My loads are only 6.8 of Unique in the specials and 8-10 of Unique in the mags.

I understand all about bullet dia.,bore dia.,hardness of alloy used and all that. These loads shot great before now the leading. So am I not getting the moly coating out? If that is the case what would the suggestions be for a bore cleaner to get the moly out? :?: :?:

Guess this should be in the Reloading section,sorry.

 

[Leucoandro]

I am no expert here. I have stayed away from moly coated bullets because of what I have read. Sure it can make make a situation where the barrel and bullet have less resistance, but it can also build up in the barrel. When the moly builds up in the barrel, it can apparently be a real PITA to remove.

I must say that I have used moly on occasion though. I have a small tub of it that I put on the bearing surfaces of the slide/frame (semi-auto). I figure a bit of build up there will not hurt anything, and actually might tighten the fit on many of my handguns. I have also been known to run a patch with moly down my barrel on rare occasions (only after fully conditioning the barrel).

From what I have read you will want something like Brownells JB Bore Paste to remove the moly from the barrel.
http://www.brownells.com/.aspx/pid=1160/Product/J_B_reg__NON_EMBEDDING_BORE_CLEANING_COMPOUND

After you remove all the moly from the barrel you might want to try JB Bore Bright to smooth out the inside of the barrel. It is a final step after cleaning. I do this after several shooting/cleaning sessions until the barrel is buttery smooth (This stuff really works).
http://www.brownells.com/.aspx/pid=1161/Product/J_B_reg__BORE_BRIGHT

After I finish with the bore bright, I will run one patch with moly on it down the barrel and work it in. I then remove the excess.

If the inside of the barrel starts to loose its smoothness, I will repeat the bore bright process again until I have a nice smooth barrel and then do the molly treatment again.

Anyway, in my untrained opinion it sounds like you have a slight moly build up in your handgun.


Charlie

 

[Bucks Owin]

I'm as confused as you regarding moly. Some renown handgunners say it must be in the lube, at least in some portion...
LBT has a lube that they say you can SHOOT out any leading that may occur. (I'm gonna test that stuff once the Super Moly runs dry in my sizer... :? )
For enough info to keep you confused, go here... :roll: :lol:


http://www.lasc.us/FryxellLubeCastBullets.htm