Current S&W 625 info wanted

[Pistolero]

Bass has it on the checking for thread choke. Shoule be able to feel it when sliding a slug
from the muzzle, if the bore lubed, once it is going shouldn't take much to keep moving
in the same diam, if it is lubed. Hit a .001 or .002 tigher section at the frame, should be
clearly there.

Bill

 

[Bass Ackward]

I have wondered about the alignment issue. I've noticed there seems to be more wear at the very bottom of the forcing cone.

Then you have found the issue. Now you need the cause. This makes that slugging drill I outlined MORE important than ever. A constriction can be severe and distort the cone slightly. Do anything to S L O W down a parachute base (plain base) and they'll blow out & polish the cone to look worse than it is. The barrel could in the frame wrong. Had one of THOSE once. Or the crane pivot could be limited to not allow the bullet to lift the cylinder. You can fix that easily, but you DON'T want to build slop into the gun as a work around. Slug it FIRST. You can use that same slug to check your throats uniformity as well. So don't let it hit the floor.

One more eye test. Make SURE the gun is unloaded, close the cylinder, point the gun at your eye. Look at the curvy line formed by the frame / crane junction underneath the barrel. That should look almost seamless if all is well..

 

[Arlon]

I used a .452 sizer die pin to get the cylinder bores as close to even as possible. That made the biggest difference so far. I don't think the pin goes into the forcing cone like it should. I might take a few shots into my stock tank and see if I can recover a few bullets to check too.

 

[Bass Ackward]

I used a .452 sizer die pin to get the cylinder bores as close to even as possible. That made the biggest difference so far. I don't think the pin goes into the forcing cone like it should. I might take a few shots into my stock tank and see if I can recover a few bullets to check too.

I don't how much metal you had to remove from that one throat, but look at the face of your cylinder. Picture in your mind that you are looking at 6, very short barrels and the crowns all need to be the same.

 

[Arlon]

The blast residue on that one cylinder was obviously different than the others. After opening it up closer to the others, all Cylinder bores look the same. I ran a few slugs down it just now and after playing with it carefully, there is no detectable choke at the frame. That's one good thing. It might be a good time to play with some load development. My friends 1989 is the least picky revolver I've seen, assumed the JM would be similar. Maybe not.

The tight cylinder bore is pretty obvious here.