Chamfering prior to case forming?

[GLWenzl]

It sure makes a difference by doing an outside chamfer/deburring Tool first prior to starting the case forming process (say straight walked 360 DW to 17 WS.

Does everyone else do this first?

[SEM]

I do when I can feel it grab chatter, and after rough cutting too, I don't want to take a chance albeit slight scratch the die

[GLWenzl]

I didn’t consider scratching a die but I thought a small radius might help alleviate cracks from forming at the mouth. And it proved to be true today on the little test I did.

[SEM]

GL might you share your results of the test

[GLWenzl]

In one of my case forming steps I took a larger step. The brass that wasn’t chamfered the cases started to deform in the mouth area. I lost a total of 6 cases (but I was able to salvage them and just completed making the lemons into 22 Jet lemonade.

There may have been other contributing factors that I’m not aware of but whatever it was it happened mostly in the last 10 cases?

I don’t know for sure if it really matters but I always prefer to have a radius instead of sharp square off corners when working with any kind of metal.


I didn’t know if others started their case forming with a chamfer or not. Most if the time it seems like a waste of time. But taking a case mouth down from 357 cal to 17 caliber is a lot of change.

[georgeld]

Seemed to help when I was making VR's from 5.7's.

did you anneal them too?

Always good to share info and results.

[GLWenzl]

No, I have not yet anealed the brass George. I am tempted to wait until after the first firing. I have a good snag fit so the case isn’t going to form much at all. But moving that much brass without anealing, I’m
Sure there’s a risk of split necks?

[GLWenzl]

anealing is completed and so was everything else.

I forgot how accurate and fun this little 17 is!! Way more accurate than a contender should be. No wind and just a nice day.

Looks like the last time I did this I actually found that chamfering and deburring throughout the necking process seemed to help.

Decided to look for a little info and realized that I need to come here first the next time. Post #17 would have saved me a little grief. Interesting that post 17 would help out with a 17.

http://www.saubier.com/forum/showthr...?t=7548&page=2