Case neck turning

[jmorris]

It seems that there would be senerios that generate this problem more or more often.

Absolutely, turning so the neck is thinner than the shoulder is a quick way to create them. That said, if your bullet doesn’t go below the neck, it wouldn’t even be a problem if one existed. Like this.



Dies will make a difference too like a Lee collet die vs bushing vs regular FL die as well as how each is set.

Why I like to set dies up so the case is under compression when the bolt is closed, when I can. It minimizes brass movement.



Less trimming is another advantage of the practice.

 

[AJC1]

Absolutely, turning so the neck is thinner than the shoulder is a quick way to create them. That said, if your bullet doesn’t go below the neck, it wouldn’t even be a problem if one existed. Dies will make a difference too like a Lee collet die vs bushing vs regular FL die as well as how each is set.

Why I like to set dies up so the case is under compression when the bolt is closed, when I can. It minimizes brass movement.



Less trimming is another advantage of the practice.

So are you sizing .000 or +.001 from chamber.

 

[jmorris]

.000 would allow the bolt handle to drop. If the sized case that only allows the bolt to drop half way were a ground “no go” chamber gauge vs springy brass, it wouldn’t allow you to fully close the bolt.

 

[AJC1]

.000 would allow the bolt handle to drop. If the sized case that only allows the bolt to drop half way were a ground “no go” chamber gauge vs springy brass, it wouldn’t allow you to fully close the bolt.

I believe the bolt cams .003 so as long as you can get some engagement one could heavy hand it shut. Some of the loads my dad gave me I had to cam in, but he never used comparators to know. I don't prefer to cam in, but I do clean and grease my lugs every time just in case.

 

[chas442]

I was curious About how much brass was left aft turning. I took a case that I had turned and increased the length of cut in 0.004" increments. I went to 0.016" total when it cut thru and separated neck from shoulder.
I'm using an RCBS neck trimmer with their pilot/reamer. I'm not seeing any cutting on the interior of the neck.

 

[243winxb]

I'm using an RCBS neck trimmer (#2?)with their pilot/reamer. I'm not seeing any cutting on the interior of the neck.

If using this https://www.rcbs.com/case-processing/trim/case-neck-turner-with-auto-feed/16-98860.html Instruction say to full length size, trim & deburr before turning. The expander would be used.
The diameter of the reamer should be measured. Hopefully its under bullet diameter by .002" or more ?
Your FL die expander diameter should be compared to your reamer/pilot diameter. What one is larger in diameter??

The 6.5 grendel maximum neck diameter is .293" of a loaded round.