Actually I was shooting Federal Champion FMJ from Walmart when I had this problem, at 13.97 per box it's made the 610 cheaper to shoot than either my 38 or 357.
It wasn't shaving lead, it was stripping jacket fragments. When this happend, it resulted in a bullet with raw torn lead being sent downrange and caused a lot of lead buildup in the first 1.5 inches in the barrel past the forcing cone. Getting the barrel clean after the first range outing was a huge PITA because of the leading. I also found a jacket fragment in one chamber that was 5/16 inch long by 1/8 inch wide and it was a bit of a hassle to free it from the shelf where it had lodged. Good news is that the chamfers that I added has solved that problem and it still headspaces the 10mm properly. Now all I have to do is lap the forcing cone and I expect I won't ever have to worry about leading.
I'll also note that my issue seems to be rare. It may simply be that I recieved a cylinder that had not had that edged deburred due to a missed finishing operation. Sometimes things like this can happen to the best of manufacturers. Unfortunately, dealers are not going to stock a "niche" model such as the 610 so I have no way of checking other samples to see how their chambers were finished. Good news for me is that it's fixed now and the only other refinement my 610 needs is some smoothing of the forcing cone because it's rough enough that it's causing a very minor bit of leading.
I wish that S&W would wake up and smell the coffee. Commercial rimmed cartridges are now sold at such low volumes that it's become expensive to shoot them. The days when the only ammo cheaper than 38 spl. being the 22LR are long gone. Makes me wish I could go back in a time machine to 1972 and pick up 10 or 20 cases of 38 spl. at the prices it sold for back then. Today the ammo that is sold at the highest volume is the 9mm with the 40 S&W running second, which is why they are the least expensive higher powered calibers on the market. I believe that if S&W were to offer 9mm moon ring cylinder assemblies for the newer 686's and 620's they would find a stampede of buyers for them. In addition, by offering a 40 S&W specific cylinder for the 610 they could probably increase the demand for that model, perhaps enough to justify adding a 3 inch model to the standard lineup.
BTW, I am a fan of the 40 S&W. I happen to think that a 180 grain bullet running at 1050 fps. is certainly adquate for personal defense and it's a compromise that yields a recoil that is easily controlable. No, it doesn't have the punch of the 10mm, however it is NOT a weak round. Fact is I like the 40 enough that 4 of my six handguns shoot that caliber and I found that I shoot it quite well.