Scratch my neck

[Link]

I must have picked up a little hard carbon after annealing. My necks have light scratches. I can remove the scratches with a slight turn with steel wool. I cleaned the bushing with JB, no help. I guess I will buy another bu. If I had a nitrate bu instead of steel maybe this wouldn't have happened?
OH WELL. ;{

 

[alf]

Use a brass brush wrapped with 0000 steel wool chucked in a drill, a little Flitz on it won't hurt either.

 

[Leeman]

Are you sure it's not from oxidation on the surface of the necks after annealing? It's reported quite often and I also experienced it. Now I just tumble the cases in corn/rice after annealing before any other operations and don't get any scratches on the necks during sizing.

 

[Webster]

I must have picked up a little hard carbon after annealing. My necks have light scratches. I can remove the scratches with a slight turn with steel wool. I cleaned the bushing with JB, no help. I guess I will buy another bu. If I had a nitrate bu instead of steel maybe this wouldn't have happened?
OH WELL. ;{

Examine the bushing with a magnifying glass, you should be able to see anything that would cause a scratch. Any tiny burrs of brass on the neck o.d. opening get dislodged and dragged down the neck.

You must lube the necks when sizing some guys don't. The neck is the most heavily sized part of the case. It only makes sense to lube it.

I used steel bushings for 30 years without a problem. I don't think an expensive nitrided bushing will help. The scratches have to be created by particles being dragged down the neck.

If the bushing is clean and the case neck is chamfered clean and lubed you shouldn't have a problem.
Possible high points or particles.
1. Junk adhering to the bushing. Easy to verify.
2. Neck o.d. not chamfered. Easy to check
3. Junk on the neck surface. Clean and size.