Originally Posted by Buano
OK, I'm not a dummy but I have no experience in this area so I may sound like one. Years ago I worked as a machinist to put myself through engineering school so I don't think this should be beyond me. I just need to know where to start.
Is there a good reference on barrel lapping? Do I need to create a plug to imbed the lapping compound into or can I simply use it on a patch or swab?
Any guidance is appreciated!!
Everyone has to start somewhere,so hear goes.
I suggest you find a factory take off and practice on it first.
To do a proper job you almost have to have a bore scope, But if you dont you can use a tight
patch as you go to feel the improvement.
Buy some fine lapping compound (1000 to 1500 grit non embedding) dont use valve grinding compound (To aggressive).
Using an old bore brush brush with some of the bristles ground off (About half way down the
brush )place the brush in the bore from the reciever end about 1'' from the muzzle.
Next ; Melt some tire weights or plumbers led and carefully pore the led down the barrel until it
fills to the top.
After cooling you can push the casting out the crown and trim the sprue off. I would recomend that you practice this step until you can cast a good pill.
When you have that mastered, apply a small amount of lapping compound to the casting and insert it back in the muzzle with the cleaning rod attached threw the action/breach. (Note do not turn the broach around, place it in the same location and orientation as it was cast. Carefully start the broach by hand in the rifling. once started place the barrel horizontal and begin to lap never allowing the casting to exit the barrel.
A word of caution: don,t over do it , lapping causes barrel wear and shortens life . so this is a case
of "Less is More" . only lap enough to smooth some of the tool marks out. the bullet will do the rest
If lapping is done incorrectly it can ruin a good barrel, so practice on an old or take off barrel first and then if you are still intent on proceeding , be careful.
J E CUSTOM