Reamer neck taper

[Doug Beach]

Many standard reamer prints show a slight taper to the neck, being slightly larger at the neck / shoulder junction, than at the case mouth.
What is the purpose of this?

 

[Walt Krafft]

Ease of manufacture and to make sure the case can be extracted.

 

[HTSmith]

I've talked to JGS and Manson this week about a 6BR reamer. Both of their standard reamers taper the neck diameter--.272" at the shoulder to .271" at the mouth. When I asked about this they both said it was CIP standard and designed for factory Lapua ammunition. Now I'm wondering if I should order my reamer tapering from .273 to .272 or just get a parallel .273? Probably silly to fret over .001

 

[TrxR]

I got my 30br reamer from manson with no taper as was suggested on here.

 

[Dusty Stevens]

Ive never got a tapered one

 

[HTSmith]

Of course varying even one dimension puts you into custom pricing. My sizing dies have no taper in the neck that I can tell.

 

[Dusty Stevens]

If you turn your brass straight, and your dies are straight, who cares if the chamber has .001 taper on the neck? Use your gunsmiths reamer is another option

 

[tclaunch]

I actually order all my stuff with a taper. I think it gives the donut a place to live more outa the way.

 

[HTSmith]

If you turn your brass straight, and your dies are straight, who cares if the chamber has .001 taper on the neck? Use your gunsmiths reamer is another option

Yeah it probably ain't that big a deal. I have three 6 BR's now all with slightly different chambers. It is a pain to manage the brass. I was hoping by getting my own reamer and go gauge I could simplify things going forward. My gunsmith has had some serious health challenges and he is probably going to close up shop.

 

[carlsbad]

Just went through this with Manson on a 284 win reamer. thought about it and told them to make it straight to the spec I asked for. that said, I think the taper isn't a bad thing. Makes it harder to answer the question "what is your neck clearance?". --Jerry

 

[Doug Beach]

I’ve got reamers cut both straight and tapered. I can’t see any functional difference, but wanted to check the collective wisdom.

 

[Iowa Fox]

If you turn your brass straight, and your dies are straight, who cares if the chamber has .001 taper on the neck? Use your gunsmiths reamer is another option

Thats what has me wondering about this reamer tapper thing.

 

[Dusty Stevens]

Thats what has me wondering about this reamer tapper thing.

Are you wondering if that .001 makes a difference or wondering if every reamer has it?

 

[Iowa Fox]

I'm wondering what their reason and thinking is. I just checked the reamer print on 2 of my chambers and they are square. Or at least that is what the print shows.