I but on a new Shilen 32 cal. barrel (chambered in 32 RKS) and after a few rounds when I run a wet (Hoppies) patch there are streaks of lead on the patch , the lead pcs. are fine wire like looking . There does not look to be any gray streaks in the bore as can be found with lube failure.
The rifle shoots fair groups which seem to shrink after 20 rounds or so but it would seem like it would do better if there was not the lead in the bore.  I have fired as many as 75 rounds with out cleaning and there seems to be the same amount of lead in the bore as when only 10 shots are fired.
Does any one have a suggestion as to the cause and the cure for this leading.

Thanks for any ideas
DaleS

I also have a Shilen 32 cal in 32-40. Since day one I have also gotten those fine lead wires. I have about 1000 rounds thru the barrel and other than the "wires" there isn't any sign of leading. With the barrel scrubbed with a bronze brush and solvent (super clean) the first couple of shots usually are off of the target but things settle down in about 5 shots. I do not clean between shot strings and I can still get good groups at 200 yds. after 80 or more shots. I worried about the wires for the first couple hundred shots and just lived with the fact that is what the barrel does. I shoot a CPA, 1:20 and use NRA's ALOX lube. At Castbullet bench matches I can keep up with the Gas Check guys that shoot 308's in the 2000 fps range.

Oldman try doing the same!

If you fellows are not getting a good gas seal seat the bullet in deeper and give it another try. My rifles shoot best with the bullet engraved all the way through the baseband so don't let become a concern if you need to go deeper.

JLouis

I have fired a case with out powder and bullet seems to seal the bore. I have used the same lube (Bees wax, Crisco, bag balm and canola oil with other barrels and worked fine but I tried some alox schuetzen lube jut to make sure it was not the lube. 
Maybe lapping the bore would help?

DaleS

He may be referring to the base of the bullet protruding such that lead is being melted before it is pushed all the way into the bore.
  The only time I have had leading in my .3201 Shilen 32-20 was while firing off a bunch of 32-20s to empty the factory-loaded cartridges....dumass....I use Emmert and run a dry patch through every other relay.

I use a weber breach seater and seat the bullet so the rifling cuts half way thru the base band. The base band is .323 and the barrel is marked .3195. I suspect that there is a small bur from the rifling being cut that shaves the small wires I get. Now mind you that these wires are so thin that I can only see them with a real bright light and catch the reflections. Think of a single strand of dental floss. The rifle will hold its own at the range. Personally I do not like to put abrasives in the barrel. I suspect the bur will slowly be worn down with shooting. Just my 2 cents worth........