Removing LARGE burrs/raised edges on lands

[HighUintas]

Looks better to me, if in the same location.
In 50 hesrs of shooting black powder rifles, I've never observed this problem until now.

Yes I try to look at the same areas although it's hard to pinpoint the exact same spots.

These bore scopes can be bad news.... They may make you think you have all sorts of problems when what actually matters is how it shoots.

So I'll have to make sure I shoot in a place I can find my patches on the next outing. It does seem to be shooting much more consistently and I think is probably more accurate than I can hold. So as long as the patches look good, I think it should be good to go.

[hudson]

With that barrel several reasons I can think of for the mess. I would start with conventional led lapping and try it out. In the pictures a couple of spots there is little hope for except for freshening it out. I have seen a couple of really bad looking barrels that really shoot well so you never know until you try.

[HighUintas]

I think I've got this problem whooped. Although there is still a visible raised edge or burr over much of the land edges, I think it's smooth enough it doesn't cut patches.

I shot a bunch of minute men 0.020 patches with 0.526 ball over the weekend in the gun, and the patches looked PERFECT. It's probably more of a testament to the patch quality. Man they are tightly woven.

With the 0.020 minute men, it measures with my calipers hard as I can squeeze them about 0.018 when new and unwashed. After a washing and drying, they're 0.020-0.021 and TOUGH.

[mossyhorn]

I had the same problem a while ago. I used a bore brush with maroon scotch bright that was tightly wrapped around brush and a little thin oil. The brush was approx.
bore dia. so I had to thinly wrap the scotch around brush and pass through bore several passes. You will likely need a metal bore rod if tight.

[Daryl]

If that is a "normal" .54 with .540" bore, we'd be using a .535" ball and the same or thicker patch.
I know Taylor had some .020 denim he was using. I've got so much 10 ounce denim, that's all I use now. This last batch measures .021" compressed.

[Waksupi]

Some do a hybrid approach - shoot about 20 round balls with the patches loaded with lapping compound. Again, a .490 ball and doubled canvas patch would carry a lot of compound. I’ve never tried this but some say it’s effective and quick.

If you do this, reduce the load to around 10 grains, ten times, clean the bore and test ten rounds. Repeat until bore is smooth.

[Daryl]

Yes, lower speed for fire-lapping is the stated methodon the "kits", whether rifle, pistol or smoothbore.

[Scota4570]

Below is some information in the 3M hand pads.  They have abrasive embedded in the fibers.  They come in various grits from every fine to very coarse.  I also see some have carbide abrasive, that may cut faster than the aluminum oxide.  I am low on the maroon pads, about like 320 grit.  I will order a variety to see how they work. 

https://i.pinimg.com/originals/99/86/69/998669c7c3dbce7fb874357990de38de.png



https://www.3m.com/3M/en_US/metalworking-us/products/flat-stock/hand-pads/

Fire lapping a ml?  That seems like it may have problems.  The greatest cutting force will be a the muzzle.  That could funnel the muzzle.  That could be bad.  In breech loaders the taper created is the opposite witch is good.  Before I tried to fire lap a ML I'd lead lap it in the traditional way from the breech with a guide.  That makes it possible to make the bore uniform and keep the muzzle tighter.  I have had lots of success with this.  I am also shocked at how poor the bore quality is in some barrels.