So I bought a new sako a7 300 win mag. I'm in the process of getting a scope and will be sighting in soon. Anyways I've never actually broke in a barrel I've just sighted in and gone hunting. What process do you guys do or do you even bother?
I typically use the following
Clean rifle before firing round
Clean after every shot for first ten rounds
Clean after 6 shot for the next 30 rounds
This sounds like a lot of shots but I have had good results with this method. The velocities seem to stabilize once you get it broke in. Just my 2 cents but everyone has their own opinion.
I have a Shilen barrel on my gun and I'm not sure if the gun mentioned in the thread has a similar type but this is from their website.
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.