neck reaming

S

stagpanther

New member
I do a fair amount of necking up/down of various cartridges and have a neck outside trimmer--but not inside. I read the Forster is quite popular but also read the K&M is highly rated--so I went ahead and ordered a K&M kit off of their website. Trouble is--I couldn't seem to find any resources on the website such as a "how to" owner's manual (unless I just missed it). I'd like to come up to speed before the it gets here on it's proper use. Any suggestions/ideas?
 
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Yes--I meant reaming--used the wrong reference point--I think of turning as one operation for neck trimming--inside and out. The K&M outfit looks pretty unique. Thanks for that.
 
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I use the K&M tool to outside turn and inside ream in the same operation. I do this with re-formed brass (223 to 221 Fireball, 30-06 to 25-06). You need the cutting mandrel. Nothing to it really, set up the same way for outside neck turning and have at it.

I cross-sectioned some brass I processed just to see how much metal was in the critical areas. I did not find any problems and my brass is extremely uniform.
 
I really couldn't tell what did what--so I ordered "the whole shebang" when given the options at the kit purchasing window--that would be nice to get the outside turning and inside reamer operations done at the same time since presumably that would reduce "concentricty wobble" that might happen in two different operations.:confused:
 
Around here there is no shortage of reamers, I have neck reamers, to ream a case neck I have to support the outside of the neck, for me I can not remember when it was not like that.

I have three neck reamer dies, one of them is a sizing die that allows me to ream the neck with the support of the die, expensive? $200.00. and the other two are neck sizing dies that support the neck while the neck is reamed.

F. Guffey
 
I use the K&M tool to outside turn and inside ream in the same operation. I do this with re-formed brass (223 to 221 Fireball, 30-06 to 25-06). You need the cutting mandrel. Nothing to it really, set up the same way for outside neck turning and have at it.

I looked at K&M site and didn't see a neck reamer. I've not heard of device that will ream and turn in the same operation. Thinking you need a mandrel to support the case as you turn the neck on the outside. But maybe I misunderstood what you saying.

If I had it to do over, would've bought 21st Century's neck turning lathe. Lot of money but sweet!

https://youtu.be/bePkl0E1z5U
 
The video - looked like a good tool to me but nothing I can not do and have not done with a drill and a Lee 3-jaw chuck with excellent results. The K&M chuck is an excellent tool too.
 
Around here there is no shortage of reamers, I have neck reamers, to ream a case neck I have to support the outside of the neck, for me I can not remember when it was not like that.


I use a Hornady trimmer for my reaming and trimming. Acquired my trimmer first so went with a Forster reamer since it works with my trimmer. But it doesn't support the outside of the case neck as it reams. It attaches to the trimmer via a shell holder. I don't ream all that much brass except when making 270AR brass or prepping new Starline brass for my Creedmoor. Hopefully the lack of outside support doesn't matter for my needs.
 
I have 4 carbide cutting mandrels coming with my K&M kit for 6, 6.5 and 7mm as well as for 270.
Click to expand...

The only time I have found neck turning and reaming necessary is when forming cases, I have found when forming cases for generous necks turning and or reaming was not necessary. All I was trying to do was tighten the necks of the cased on a pile of bench rest type rifles.

F. Guffey
 
Couple of cartridges I'm contemplating that may have a tendency to donut and possibly spike pressures--that's the reason I'm looking at reaming.
 
One thought about the donuts, won't they blow out when you fire form the case? The TAC6 brass also develops a donut when forming the brass. But blows it out when fired for the first time.
 
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The K&M cut the donut but it's not going to ream inside of neck.

Cutting eeth on end will remove the dreaded case "doughnut"
 
"The K&M cut the donut but it's not going to ream inside of neck."

How can you assert that? if the ID on the neck is smaller than the cutting diameter on the reamer it will most certainly cut/ream the neck.
 
Flashole

This is from K&M

Features

Made Specifically for the K&M Neck Turning Tool
Carbide reduces friction caused while turning brass
Cutting teeth on end will remove the dreaded case "doughnut"

This pilot is ground from carbide material and also has cutting teeth ground into the end for removal of a case doughnut.

You don't get doughnut every time so they just took standard pilot and cutter has smaller dia. You need to look at picture that was post from Midway. I have K&M I use but I don't use their cutter. I use the Wilson

https://www.creedmoorsports.com/pro...MIw7z5t5eR2QIV2brACh35KQvyEAQYBSABEgIASPD_BwE


I looked and you posted picture of the cutter. The doughnut is not at the start of the neck it's at the end so cutter doesn't reamer inside of neck. If you had reamer Like Wilson and turning neck same time, you couldn't do it by hand. If you can't figure out picture you posted then you need help
 
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