Brass neck after firing

[JR1200W3]

So coincidental then he hit the usual neck thickness...

Ya. Very well could have a neck thickness that isn't .014. And that wouldn't even be strange.

You need a ball mic to read neck thickness with any degree of accuracy. It's just how it is. I didn't make that up and it's not my opinion.

 

[Tokay444]

(loaded next diameter - bullet diameter)/2=neck thickness. No special mic. Very accurate.

 

[memilanuk]

(loaded next diameter - bullet diameter)/2=neck thickness. No special mic. Very accurate.

So, since the OP has previously stated his loaded rounds measure 0.291“... 291-264 = 27, 27/2 = ~13.5 thou

Or within a half thou of what he measured with his calipers.

Moving on...

 

[Changed]

I use the l.e. wilson trimmer so the ID of the neck doesn't get mangled from the pilot on other trimmers like redding. And I use a an rcbs vld chamfer (ID) and le wilson deburr (OD). Hopefully I got those labels correct. I always get them backwards. I was planning on sending in a piece to hornady to have them make a custom coal modified piece of brass and when I tried putting in a bullet I had difficulty so I tried several with the same outcome. Which led to my question. I remember my .223/5.56 fired brass neck opened up wide enough for bullets to fall in really easily so that got me wondering if something was wrong

I just spot checked fired cartridges from two rifle calibers. In both cases, neither will easily slip over a projectile of the same diameter. I don't care. They are both lasers.

This method is the cheapest and easiest way to find your lands. No special tools, and the result is far more accurate. You should remove your firing pin for this method. I also remove my ejector. You can also use the Cortina or Speedy methods. All work off the same general concept.

 

[memilanuk]

FWIW, I just grabbed some of my fired 6.5CM cases (Lapua SRP, 5x fired)... they all measured ~0.295 outside neck diameter. The necks are ~13.5 thou thick (yes I used a ball mic). Picked up some bullets (B130VLD) and they all dropped right in each of the cases. As they should.

Just out of curiosity... do you have any once fired brass? Stuff that you haven't messed with yet? I'm curious if a bullet will drop down one of those?

 

[JRBullock1987]

FWIW, I just grabbed some of my fired 6.5CM cases (Lapua SRP, 5x fired)... they all measured ~0.295 outside neck diameter. The necks are ~13.5 thou thick (yes I used a ball mic). Picked up some bullets (B130VLD) and they all dropped right in each of the cases. As they should.

Just out of curiosity... do you have any once fired brass? Stuff that you haven't messed with yet? I'm curious if a bullet will drop down one of those?

I don't unfortunately

 

[918v]

Case mouth diameter is usually tighter than the rest of the neck. That’s why the bullet doesn’t drop in.

 

[308pirate]

Well I shot a .274 4 shot group when zeroing a new scope yesterday with a random load. First shot was low. I corrected and shot a 4 shot group with the remaining 4 rds of the load. Amd it's went into the .274 so I thinks it's gunna be a really go9d shooter. It hasn't been 100 percent broken in yet. Only has 50 rounds on it.

Then I would stop worrying about things that don't matter, like how the bullet fits in a fired case.

 

[JRBullock1987]

Then I would stop worrying about things that don't matter, like how the bullet fits in a fired case.

Ok ill just not ask questions to things I'm curious about. Who wants to learn anyways.

 

[308pirate]

Ok ill just not ask questions to things I'm curious about. Who wants to learn anyways.

You asked for opinions. Not all those you will receive will be to your liking.

 

[JRBullock1987]

You asked for opinions. Not all those you will receive will be to your liking.

Lol oh ok

 

[JRBullock1987]

So I was looking i inside the necks of the brass after I cleaned them and noticed what almost looks like rust colored crap on the inside of the necks. Not sure what it is but im thinking it's whats preventing the bullet from sliding into the case cause even with lube my expander mandrel was sticking like crazy. It's whatever but I've not seen this crud inside a neck before. Especially a clean neck. Very interesting to me