Have you shot your PC bullets?
You might be surprised to find that you don't have any leading even if you groove diameter is 1-2 mils wider than your bullets.
First of all, are you measuring the swaged bullet below the rim mark and if so, is there any portion where it was not swaged and still sitting above the case rim? If it is at or bigger than the groove diameter, you'll still be sealing off the gas cutting.
Even if you are getting a bit of gas cutting, you are likely cutting the powder coat before you get down to the lead. For the short time the bullet is in the barrel, the cutting may not be occurring long enough to get to the lead. I've seen this in some of my barrels:
This is probably from gas cutting of the PC. It wipes away with a dry wadded up paper towel so its obviously not lead.
Load up 50-100 and go out and shoot 'em. Check the barrel for leading after a few mags. The worst that could happen is you'll spend 30 seconds to a minutes with a Chore Boy wrapped mop to scrape out the lead.
The best that could happen is that you'll have cartridges that will shoot in any gun without hanging up and an easy clean up.