Fixing a barrel with a tight spot in it.

I have this 25 LW barrel and it has some problems.

It shoots Kings very well, but perhaps I should define what that means to me. 35 yards 1/4 to 1/3 inch, 50 yards 1/3 to 3/4 inch, 100 yards 4 out of 5 around or under an inch with a flyer and at times well under an inch for all five shots.

But I can’t hit my ass with both hands with any other pellet, and that includes the vaunted Predator, which is a distant 2nd place, being as the groups are 3 times larger than the Kings, not really bad, but not real good either.

I have tried, Kodiaks, Benjies, all weights of Jerrys slugs, EJ’ and Predators to no avail in my quest for accuracy with anything other than Kings

I can’t in good faith sell the barrel to someone else, unless they have a cheap supply of Kings and don’t mind shooting Kings exclusively.

I have tried different frames, springs, hammers, breeches, scopes, pellets, but they all shoot lousy except the Kings, and then only with the stock spring, breech and hammer assembly and only below 1000 FPS.

I am not using a LDC, if I did it would make no difference.

Some would say I should leave it as is, but a 22 Condor can shoot Monsters of the same weight at the same velocity and have a better BC and SD.

So here is what I think is the trouble:

When I push a pellet down the bore with a cleaning rod, the first chambering section or what most call the “lead”, the pellet goes in very easy, pushing it further it gets tight as it goes thru the machined down section that the breech rides on, then it free falls under the weight of the cleaning rod to the last 3/4 inch or so that comprises the choke.

That “lead” part will let the pellet fall out of the breech, if you decock the rifle and then cock it again, annoying but I doubt if that is the trouble.

The fact that it gets tight in the machined down section the breech rides on, tells me that area was choked down during the maching process.

When the pellet is blown down thru that restriction, because it is moving the air does not force it to open the skirts again because the pressure is less as it goes into the 20 inch or so loose part,as a result it does not re-expand to fit the loose part and is rattling down the barrel until it hits the choke.

With Kings it is different, they have such a thin skirt, that they re-expand in the loose section of the bore and do not “rattle” down the tube like other pellets do.

To fix it I believe I have two options:

I can have the breech section cut off and a new breech and lead machined on the barrel which will make the barrel shorter. Or I can lap that breech section and make it match the rest of the barrel except the choke.

If I have it cut and remachined it is a one shot chance. If I lap it and it does not work or ruins that section, I can still have it machined.

I have considered getting fine polishing compound, rolling a lead slug in it between two sections of glass to embed the compound, using two cleaning rods, one in the muzzle, one in the breech. With the two rods in contact with each end of the slug, tapping it to bump it up in diameter until it is tight, then pushing it back and forth with the two rods inserted in the muzzle end and breech, and repeating until I get the tight spot the same diameter as the loose portion of the barrel.

Or I can just put some polishing compound on a patch and use a pistol rod to lap the breech area.

Any ideas on how you folks would fix this?

If I choose to remove the breech and redo it, who can do this and has the time?

Regards,

Roachcreek