I am providing a few diferent opinions on the break-in. As you will see the real issue is what you start with. A Shilen or a Lilja wont require the break-in. A common off the shelf barrel would benefit from the treatment. That said, reading the below you can make up your own mind. I don't think that the LEGP barrel is "hand lapped" and would benefit form some breakin procedures. Do some homework of your own to see if it's for you. Some folks really don't care as i said before. Many are happy with 2" at 100yds. I'm not.
How should I break-in my new Shilen barrel?
Break-in procedures are as diverse as cleaning techniques. Shilen, Inc. introduced a break-in procedure mostly because customers seemed to think that we should have one. By and large, we don't think breaking-in a new barrel is a big deal. All our stainless steel barrels have been hand lapped as part of their production, as well as any chrome moly barrel we install. Hand lapping a barrel polishes the interior of the barrel and eliminates sharp edges or burrs that could cause jacket deformity. This, in fact, is what you are doing when you break-in a new barrel through firing and cleaning. Here is our standard recommendation:
Clean after each shot for the first 5 shots. The remainder of the break-in is to clean every 5 shots for the next 50 shots.
During this time, don't just shoot bullets down the barrel during this 50 shot procedure. This is a great time to begin load development. Zero the scope over the first 5 shots, and start shooting for accuracy with 5-shot groups for the next 50 shots. Same thing applies to fire forming cases for improved or wildcat cartridges. Just firing rounds down a barrel to form brass without any regard to their accuracy is a mistake. It is a waste of time and barrel life.
From Lilja
Q. What is hand lapping?
A. The hand lapping process, that all of our barrels undergo, ensures that you will receive a rifle barrel that has the very best and most desirable type of internal finish that we can provide. The lapping operation brings the final internal dimensions up to size and also improves the finish. No production barrels are hand lapped, only the finest custom barrels receive this very important operation. And it is partly for this reason that hand lapped barrels cost more than lower grade production barrels.
In practice, a molten lap is cast around a rod placed inside the barrel. The profile of the rifling is cast into the lap ensuring a very precise fit with that individual barrel. The lap is then "charged" with lapping compound, oiled, and pushed and pulled repeatedly through the length of the barrel. The lap is "recharged" and oiled many times and several new laps will be cast before the lapping procedure is completed. The man doing the lapping judges when the barrel is finished by a very experienced feel for the job, inspecting the internal finish as it develops with a full length borescope, and by measuring the diameters of the
lands and grooves.
We have, over the years, developed a process that we feel gives us the very best finish and uniformity of diameters the full length of the barrel, that we can obtain. And the proof is, in our opinion, in the very minimal amount of bullet jacket fouling that our barrels produce, and in their outstanding accuracy.
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