I follow Lee Shaver’s Barrel Break in Below, But i ad Montana Extreme Bore Polish and Cleaning Compound to it, It is some REALLY Good Stuff, It flat out works!! I do it to EVERY Muzzleloader i own, All of my Rifles MUST shoot Sub MOA or they are GONE, That is a Mandatory Requirement of a Rifle in order to Secure itself a Spot in my Gun Safe. I have a 48 Gun Safe that is crammed full of Muzzleloaders, every one of them Have Bores that look like this.










Excerpt from “Breaking In a Barrel” by Lee Shaver:
Several years ago, I developed a process for breaking-in barrels for lead bullet use
that eliminated the afternoon of shooting and cleaning with jacketed bullet. It
began because I would occasionally have to get bad leading out of a barrel for a
customer, and when you charge what a gunsmith must charge to stay in business
you don’t want to spend an afternoon scrubbing the lead out of a customer’s gun.
And I’m sure the customer would rather not pay for said services.

What I learned was that when scrubbing lead out of a barrel, I could run a tight oily
patch through a few times and then take the patch off the jag. I would then unroll a
little 0000 steel wool and cut a piece the size of the patch. Place that over the
patch and then run it all through together. (The proper fit is when you have to
bump the rod a few times with the palm of your hand to get it started in the bore.)
When you shove that steel wool over a patch through the bore of a badly leaded
barrel, it may sound like paper tearing as the lead is ripped out of the barrel in a
pass or two. I can clean the lead out of the worst barrel in about ten or fifteen
minutes that way, and an average leaded barrel will be clean in a few strokes.

After using this technique for a while, I began to notice that the rifles that I was de-
leading that way seemed to lead less afterwards, which got me to thinking. We use
fine steel wool on the outside of old guns all the time to do some cleaning or spot
rust removal, and it does not damage the surface of the steel. It just scrubs it.
Which lead me to consider the fact that we are trying to break in a barrel by
smoothing the surface without cutting, and it seems to me that process would go
much quicker if we used something on the inside of the bore that was closer to the
hardness of the barrel instead of lead or copper. So I started trying the steel wool
and oiled patch technique on new barrels before shooting them. I use it about as
tight as I can get in the bore and wear out a steel wool pad or two in about 15
minutes, then I go and shoot the rifle.

How well does it work you might ask? On a few occasions, I have built a new rifle
and taken it to a match without ever having fired the rifle. All have performed
flawlessly in their first match and several times I won the match or set a record
with them. On one occasion, I set a new 300 yard range record with the first 13
shots out of a barrel. This method has become a service we offer to our customers
here in the shop and I have shared the technique many times with others.

So the next time you get ready to shoot that new rifle, just remember it is important
to break in a barrel properly, but if the operation you are doing to the barrel cuts –
it is not breaking it in. It may be making the barrel smoother, but to break the
barrel in you need to polish the bore by burnishing not cutting either by shooting it
or scrubbing it.
Lee Shaver