Sometimes what appears to be lead,and looks like the small sparkly bits you mentioned is not lead. Best way to check if it is lead I found is to rub my finger across the patch with the sparkly bits. If the bits disappear, it was not lead, if it remains- lead.
Bob

If it’s the one I’m thinking of it has 3 shallow lube grooves. I have used this bullet with no trouble and so have others. However one of the shooters I see at Etna Green every year reports that while that bullet shoots fine in Indiana and at home in Ohio, when he goes to Phoenix in the winter it leads like crazy. Hot drier climates require more lube. In my opinion you are on the raggedy edge on lube. As long as it shoots well shoot it, but keep an eye on it. As soon as the groups start to open up clean and then run a patch with lanolin down the bore. Fire a fouler or two and go back to work.

40 Rod

i have heard tales of guys dipping the nose of a slightly-
leading bullet in a tin of bag-balm just before loading it.    jus say'n      VBG

I agree with Jerry and 40 Rod.  If it is maintaining accuracy, no worries.
But, if accuracy becomes a problem due to "excessive" fouling, solutions to control leading, fouling, are in order.  Learning the controls based on conditions, locations, is just another part of the sport we participate in.  Have fun and keep learning.

Cary.   

Sparkly bits are of no concern for accuracy.

Leading is when lead sticks to the barrel and comes out like lead wire or chunks. Now that affects accuracy.

Your rifle lands can shave off a few bits which are collected by your lube and generally do not stick to your barrel. These are of little concern.

If you do get leading and it starts sticking to your barrel: then you may be getting gas cutting around the base of your bullet, you have a poor alloy (too much antimony or hardness issues),  a poor lube, or too narrow a bullet.

Lead speckle mixed with your lube is pushed out of your barrel by your next bullet. Don't worry about it.

When it is hot and dry and I am firing plain base bullets at 1,800 fps I wipe the barrel with Kroil oil so that leading does not start with the first bullet fired. After that the bullet lays down a film of lube for the next shot.

Alberta Schuetzen Lube has lots of lanolin in it like Bag Balm.

Actually, I ended up pushing the bullet, nose first, through a .323 Lee sizing die (sized base band only) and mixing up a new batch of lube to the same formula. Between the two there is no sign of leading or even sparkles and it is extremely accurate. I even moved the powder charge up another 1/2 grain! I had a group in the .2s last match. Everything is fine in the neighborhood.