You might be aware that I had a Delta Wolf of a friend. It had a bad barrel.
A few days ago I posted here that I plan to increase the choke.
Please see below the pic of the pellet pushed through the barrel. It shows a bad land in the barrel causing inaccuracy. Sorry for my dirty fingers.
All other lands leave the impression as shown in following pic.
I understand that the inaccuracy is due to one bad land.
Before going to increase the choke of the barrel, I decided to polish the barrel a bit aggressively with JB Bore Compound.
Used a very ordinary method. Put brass rod in a hand drill and on the other end put a barrel polishing cloth, applied JB and gradually polished the barrel while rotating the brass rod with drill machine.
I did gradual polish, more polished the breach area, then a bit less next area and so on and so forth.
Also polished the choke but minimum as compared to the rest of the barrel.
Cleaned the barrel and pushed a pellet through the barrel. The pellet came out in much better shape.
Installed the barrel on the gun and found that accuracy had been improved very much.
Un Installed the barrel and repeated the whole process again.
Now the pushed pellet through the barrel came out a bit loose but in much better shape.
Impression of all lands was there but no land was damaging the pellet now.
Again Installed the barrel on gun. Now it's shooting very very well at shot range of 24 yards.
I shall try it on longer ranges to conclude if it has been completely fixed or needs some more work.
If it needed more work, that will be just polishing the choke and if the choke will get unacceptably loose, I shall develop more choke.
The simple equipment used is here shown in the below pic.
I hope that I shall be completely successful in converting this bad barrel into good barrel.
Bhaur