A nick in the case mouth, what effect may this have?

[Fox]

I was trimming brass and my trimmer nicked the case mouth. Do you think this will have any effect if the case is internally and externally chamfered properly?

 

[bigedp51]

A photo would help to answer your question.

 

[vagrantviking]

Almost certainly won't have any effect whatever.
Pics wouldn't hurt.

 

[Fox]

I am at work so no pics of my actual setup, but less than what if in this discussion.

https://thefiringline.com/forums/showthread.php?t=547195

This is on a 6.5x55mm, I have a few cases that had this happen, I figured I would load them and shoot them and check the group to know in the future but I am about to load up a pile so wanted to know how concerned I should be with accuracy on a small nick in the case mouth.

 

[New Camper]

I've not done this trimming so can't report if this will affect accuracy. I suppose it depends on what is "accurate" to you: Benchrest bullets through the same hole, or minute of 6" gong at 200 yards? I wouldn't care if my requirements were the latter.

The most obvious issue that will arise is the nick will lead to neck splitting (probably by next loading if it were a straight wall case) unless it is trimmed off next firing.

 

[Lead hammer]

If it's small, I would just load it and use it for a fouler if you were worried about it.

 

[rral22]

Good chance it will have no effect, but when I have any doubts about a case, or any other component, I just throw it out. I don't see any reason to load anything about which I have any concerns, and I see all sorts of reasons to NEVER make a load about which I have any concerns.

 

[Fox]

I've not done this trimming so can't report if this will affect accuracy. I suppose it depends on what is "accurate" to you: Benchrest bullets through the same hole, or minute of 6" gong at 200 yards? I wouldn't care if my requirements were the latter.

Working towards a 400 yard deer rifle, my load was well under MOA when doing load testing, .5-.75MOA.

I think what I will do is load these up on their own and test that to see what the group is like for the future.

I think my trim cutter got a nick in it as well, I have 2, so I have to use the good one and keep the nicked one for 30 cal, the nick is in the blade narrower in.