03-21-2014, 09:28 AM
If you can borrow or buy a ceramic stone that is rounded about the size of the extension gaps and pull it against the inside corners it will smooth them out.
I got a couple white and ruby that are round on one side and square on the other and they work great for a lot of uses.
Brass and bullets will eject with no marks or scratches.
If you use Iosso or JB's drape a round patch over a 243 nylon brush and spin it in the throat area using a pistol rod for a little while in a cordless drill.
A 30 cal metal brush is too big and scratchy to be spinning in the throat.
Don't go in too deep.
The metal end might hit the rifling if it somehow pokes through the patch.
The hone would do the same polishing to the throat faster.
I got a couple white and ruby that are round on one side and square on the other and they work great for a lot of uses.
Brass and bullets will eject with no marks or scratches.
If you use Iosso or JB's drape a round patch over a 243 nylon brush and spin it in the throat area using a pistol rod for a little while in a cordless drill.
A 30 cal metal brush is too big and scratchy to be spinning in the throat.
Don't go in too deep.
The metal end might hit the rifling if it somehow pokes through the patch.
The hone would do the same polishing to the throat faster.