View Full Version : fire lapping, Good or bad?

May 6, 2008, 11:34 PM
Are those tubbs fire lapping bullets worth a try in a browning BAR? I finally got out to the range and was very far from impressed with accuracy, especially when my dad's 7mm BAR is a well below MOA gun. I have been working on copper fouling removal... I also plan on a trigger job, crown the barrel, and I wanted to look into these fire lapping bullets if it isn't going to negatively affect the accuracy of my gun. I have heard that they give the gun more freebore, and the fact that it is a semi auto with a magazine, I can only seat the bullets out so far. I want to get this thing to shoot. I am also going to try to get the take down screw torqued to the optimal setting, does anyone have any idea on what that would be? Any other information that you guys have to help me get this thing to shoot would be much appreciated, thanks in advance.


May 7, 2008, 10:35 AM
We are going to need more info:

What is the caliber?

What ammo are you using? Spec's?

What rest are you using?

How developed are your marksmanship skills? Are YOU capable of shooting sub-moa?

What scope is on it?

Is the scope properly mounted and screws properly torqued?

What kind of accuracy are you getting currently at what range?

What kind of accuracy do you expect to get out of it?

James K
May 7, 2008, 11:52 AM
All fire lapping does is shorten the time and rounds needed to "break in" the barrel. It will NOT magically improve accuracy.

It sounds like you are "shotgunning" on modifications with no systematic approach to accuracy tuning, just going to try every possible "fix" you have read about. That might - or might not - work, but it will certainly be expensive. For example, unless the muzzle crown is deformed, what makes you think re-crowning will help? I think you need to consult a good gunsmith with experience in that rifle before doing anything.

The BAR is capable of very good accuracy, but not every one will or can be made to shoot under a MOA. I would invest some money in loading equipment and try various loads before putting a pile of bucks into working on the gun.


Harry Bonar
May 7, 2008, 03:57 PM
I would not fire lap unless the bore is badly pitted.
It sounds like you need a good long cleaning session = you could use somd JB compound back next to the chamber = many an accuracy problem is related to excess invisible fouling.
I do not fire lap barrels.
Harry B.

May 7, 2008, 10:39 PM
I think fire lapping is somewhat like the advice I got from a mechanic friend. He said "there is NOTHING in a can or bottle going to "FIX" a car with a problem"

Harry Bonar
May 8, 2008, 09:21 PM
RUGER 4570,
Right on the old nose, an old mechanic told me exactly the same thing.
You lose a few molecules of steel every shot let alone putting abrasive on your bullets..
I do not believe in barrel break in just thorough cleaning with a bronze brush and good old HOPPES.
Harry B.