New Brass / Burr

[markT]

Bought new 22-250 / Sig brand brass. I chamfered the outside and inside of the case. When I seated a bullet a small burr appeared. I sized the brass and re chamfered inside and out. Still a micro burr at the end..
I don't have my friends rifle so I cant test chambering a round.
I used a tool for turning necks and used a "stone to remove the burr. Am I on the right track?

 

[joshb]

I load for a couple friends and my “adopted shooting trainees” . I always have their gun on site when I do, I always do the load testing and always load in a node well below max charge. We usually shoot at 100 yards so the slower rounds do just fine.
That said, if you have burrs you should trim your brass a little. Make them all the same length.

 

[ronemus]

There is often a small bur left when using a 45* inside chamfer, Using a shallow-angle "VLD" chamfer usually leaves no bur. There can also be an issue if the chamfer isn't deep enough, especially with flat-base bullets - be generous as it's hard to apply too much chamfer.

 

[piie]

You don't mention anything about other brass working - ie, did you size or did you just seat the new brass after chamfering? Did you look at neck tension - perhaps that is a tad tight?

 

[markT]

I don’t have a trimer for the 22-250 yet. (Little crow) I can see where that would eliminate my issue.
I did size the brass and chamfered in and out. It’s only 100 rds so I’ll chuck up the cases in case holder and spin it with makita drill (slowly) and use small sharpening stone.

 

[Rocketvapor]

I use a small piece of green ScotchBrite and nose the case.

 

[K22]

It's rare but sometimes if the chamfering tool is off center and you use too much pressure / force, you can create a burr. If so, uniform re-chamfering often removes the imperfection. If not, trimming will usually remove it.

I always chamfer new cases and obviously after I trim them. I also polish the necks with 0000 steel wool to remove the processing residue remaining on new cases. Before I tumble used cases, I polish the necks with 0000 steel wool to remove the carbon residue. This cuts down on the amount of time I have to run the tumbler.

Also rare, but on some rifle, the ejection process will dent the lip of the neck which can cause and out of round condition. However, this almost never leads to formation of a burr if careful sizing is used. However, if you ram the case into the sizing die that has an expander button, it can recreate a "burr / dent" in the case lip which usually requires trimming to remove.

 

[Coyotefurharvester]

New brass needs inside neck lube and a clean expander/mandrel or there will be scrapes. I also use a vld angle chamfer head, in the cordless light pressure.

 

[AccelR8]

I've been working my way through 200 new Sig 22-250 cases. First I run them through a LEE collet neck size die to eliminate any dented necks, then give them a light twist with a hand held chamfer and deburr tool. I think it's an RCBS, had it forever. No burrs after bullet seating, and I look at each one.