Thanks, I will try slugging a couple of mine and see what I get. I have some older 686 and 586 form the 80s. Also my 629 classic hunter that I shot PPC with, shoots real good. I do shoot jacketed bullets, Just stay with one load.No it is after the forcing cone and extends about 1/4" past the frame.
Basically where the barrel is screwed into the frame.
When i send a soft lead slug down the barrel muzzle end first and lots of lube in the barrel and on my lead the muzzle end is tight for the first push until the lead gets swaged down by the barrel.
It gets easier to push now until I get just mm from the frame then it gets hard to push that lead slug so hard in fact I can no longer push it by hand with my wooden dowel rod.
Basically stuck.
I have to get a small hammer and tap tap tap the dowel rod to get the lead to go that last 1" or so.
Then it drops out of the forcing cone area.
Now I take that slug that is now form fit and line it back up with the rifling at the muzzle and push it through again.
SO much easier to push through right up to the frame area and then i need to apply more force to get through.
So then i begin fire lapping the barrel.
6 rounds and then clean the barrel and push that slug through again.
I keep doing the fire lapping until that slug has the same tension at the frame junction as the rest of the barrel.
I then make a new slug for the barrel and push it through and see what I get.
Took just about 75 rounds of fire lapping bullets to do the 357 TALO.
Just about 1/2 that for the Ruger 357
Hope that explains it a bit better.