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#7288423 - 01/09/13 Opening up a seater die?
RTSJ Offline
Campfire Regular

Registered: 12/16/09
Posts: 959
Loc: SW Pa.
Can it be done? Building a wildcat that is a 6.5 Sherman. Am wandering if u can use the chamber reamer to open up a 280 AI seater die to use for my 6.5 Sherman? Using a .264 mag neck die to form the false shoulder and then fire forming. Resize the necks and ready to load. Just not sure what to use to seat with. Was gonna use a .264 mag seater but am thinking the that the .270 parent case would move around too much in the larger die and not give me a straight bullet seat. Going to have a custom set made but was wandering if this can be done for now while its taking 3-4 months to build the dies.

Thanks Roy

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#7288519 - 01/09/13 Re: Opening up a seater die? [Re: RTSJ]
458 Lott Offline
Campfire Kahuna

Registered: 01/29/01
Posts: 15127
Loc: Conundrum, Alaska
There are blank seating dies you can buy that you can use a chamber reamer to make a custom seater. But most commercial seating dies are hardened and you'll ruin your reamer if you try and use it to open them up.
_________________________
I'm not a gunwriter, that's 458 win. I'm just a gun-nut in Alaska.

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#7288548 - 01/09/13 Re: Opening up a seater die? [Re: RTSJ]
aalf Offline
Campfire Tracker

Registered: 12/02/07
Posts: 7488
Loc: S.W. Wis.

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#7288796 - 01/09/13 Re: Opening up a seater die? [Re: aalf]
RTSJ Offline
Campfire Regular

Registered: 12/16/09
Posts: 959
Loc: SW Pa.
Originally Posted By: aalf

Al.. how will that wilson seater work? Looking over dimensions of the 280AI and the 6.5 Sherman they r very close. The Shermans case walls are blown out a little more. Where the case wall meets the 40 shoulder it is .006 larger.
Thats why i was wandering with auch minimal stock if the chamber reamer could open it up just a bit to snuggly hold the case while seating the bullet.


Roy

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#7288927 - 01/09/13 Re: Opening up a seater die? [Re: RTSJ]
gzig5 Offline
Campfire Regular

Registered: 12/04/07
Posts: 408
Loc: Mequon, WI
As already mentioned, if you run the reamer into a hardened seater die you will ruin the reamer. Best solution is to make a new seater with the reamer from a die blank or a chunk of free machining steel. If you insist on using an existing die it would have to be lapped out, which would take a while and you need to know what you are doing. Might be able to open it up with a carbide boring bar and then lap, but the little bar is going to be way up in there and is going to want to chatter.

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#7289035 - 01/09/13 Re: Opening up a seater die? [Re: gzig5]
RTSJ Offline
Campfire Regular

Registered: 12/16/09
Posts: 959
Loc: SW Pa.
Originally Posted By: gzig5
As already mentioned, if you run the reamer into a hardened seater die you will ruin the reamer. Best solution is to make a new seater with the reamer from a die blank or a chunk of free machining steel. If you insist on using an existing die it would have to be lapped out, which would take a while and you need to know what you are doing. Might be able to open it up with a carbide boring bar and then lap, but the little bar is going to be way up in there and is going to want to chatter.


Can a hardened die be honed on a diamond hone?


Roy

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#7289113 - 01/09/13 Re: Opening up a seater die? [Re: RTSJ]
aalf Offline
Campfire Tracker

Registered: 12/02/07
Posts: 7488
Loc: S.W. Wis.
Originally Posted By: RTSJ
Originally Posted By: aalf

Al.. how will that wilson seater work? Looking over dimensions of the 280AI and the 6.5 Sherman they r very close. The Shermans case walls are blown out a little more. Where the case wall meets the 40 shoulder it is .006 larger.
Thats why i was wandering with auch minimal stock if the chamber reamer could open it up just a bit to snuggly hold the case while seating the bullet.Roy

I posted the link as the fastest way to get a seater.....just run the finish reamer in a smaller .264 die that will clean it up completely. Cheaper only if you're set up with an arbor press.

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#7289253 - 01/09/13 Re: Opening up a seater die? [Re: aalf]
Malm Offline
Campfire Ranger

Registered: 10/03/08
Posts: 1628
Loc: SLC, Ut
You might be able to get away with using a small carbide boring bar like one that Circle Machine manufactures and some really careful planning. I've used them over the years to cut experimental chambers and to open die bodies to give shoulder room and change neck diameters. While not as pretty as a factory produced die, they can do the job until a better one becomes available.
_________________________
Lock, Stock and Barrel gunworks
SLC, Ut
USMC 69-73

"This is my rifle, there are many like it but this one is mine. My rifle is my best friend, it is my life."

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#7289723 - 01/09/13 Re: Opening up a seater die? [Re: Malm]
greydog Offline
Campfire Guide

Registered: 06/12/04
Posts: 2599
If the seater die is hardened (some are not), it can be annealed then re-chambered. This can be done with a sizer as well after which it is re-hardened. I wouldn't bother hardening a seater and don't harden any that I make. Sizers, I carburize and case harden. GD

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#7290643 - 01/09/13 Re: Opening up a seater die? [Re: RTSJ]
Al_Nyhus Offline
Campfire Regular

Registered: 01/01/03
Posts: 900
Loc: Lower Dakota Territory
If for whatever reason you prefer a threaded seating die, Troy Newlon makes great die blanks. -Al

http://newlonprecision.com/
_________________________
Forbidden Zoner

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#7292597 - 01/10/13 Re: Opening up a seater die? [Re: Al_Nyhus]
Crow hunter Offline
Campfire Tracker

Registered: 03/27/01
Posts: 5849
Loc: Mississippi
I don't believe Lee dies are hardened, you might be able to use the reamer on one of their dies.

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#7293183 - 01/10/13 Re: Opening up a seater die? [Re: Crow hunter]
vbshootinrange Offline
Campfire Tracker

Registered: 02/04/01
Posts: 6251
Loc: RETIRED in Oregon, USA
Another option would be to anneal the seater die you want to ream with your chamber reamer.

I've been doing this for about 40 years on band saws, so that they can flex after welding, when going around the bandmill wheels.

Heat the entire die to a dull red and hold the color for about 30 seconds, then SLOWLY pull the torch back, letting the die cool very slowly.

Virgil B.

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#7293547 - 01/10/13 Re: Opening up a seater die? [Re: RTSJ]
Grasshopper Offline
Campfire Tracker

Registered: 02/13/03
Posts: 6332
Loc: Middle of the "Mitten"
Roy,

I have a threaded die blank that I'm not using... You can have it for the price of shipping. PM me if interested...

GH
_________________________
"There are things that are known and things that are unknown... In between are the doors!"

"It is far better to be alone than to wish you were" - Ann Landers


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#7296896 - 01/11/13 Re: Opening up a seater die? [Re: Grasshopper]
erich Offline
Campfire Ranger

Registered: 05/14/02
Posts: 1866
Loc: wash. state
You can use a hornady seater with the sliding sleave, just get one for a 6.5mm (260 Rem or 6.5 Rem mag) the sleeve drops down over the neck keeping the case and bullet straight. I use the same ones for my 5.6x50R and 22-250, 6mm-204 and 243 also the 25-204 and 250 Savage.
_________________________
After the first shot the rest are just noise.

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#7296937 - 01/11/13 Re: Opening up a seater die? [Re: Al_Nyhus]
EddyBo Offline
Campfire Guide

Registered: 10/28/07
Posts: 4210
Loc: SW MS
Originally Posted By: Al_Nyhus
If for whatever reason you prefer a threaded seating die, Troy Newlon makes great die blanks. -Al

http://newlonprecision.com/


Beat me to it.

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#7298417 - 01/11/13 Re: Opening up a seater die? [Re: RTSJ]
gzig5 Offline
Campfire Regular

Registered: 12/04/07
Posts: 408
Loc: Mequon, WI
Originally Posted By: RTSJ


Can a hardened die be honed on a diamond hone?


Roy


Yes. Diamond will cut any steel, but it is going to be slow going.

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#7298469 - 01/11/13 Re: Opening up a seater die? [Re: erich]
nsaqam Offline
Campfire Kahuna

Registered: 05/01/08
Posts: 16540
Loc: Hermantown MN
Originally Posted By: erich
You can use a hornady seater with the sliding sleave, just get one for a 6.5mm (260 Rem or 6.5 Rem mag) the sleeve drops down over the neck keeping the case and bullet straight. I use the same ones for my 5.6x50R and 22-250, 6mm-204 and 243 also the 25-204 and 250 Savage.


As Erich says, I use Hornady seaters on many different cartridges.
As Greydog says, there is really no reason to harden a seater.
_________________________
The Chosin Few November to December 1950, Korea.
I'm not one of the Chosin Few but no more remarkable group of Americans ever existed.

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#7300220 - 01/12/13 Re: Opening up a seater die? [Re: nsaqam]
Bobcape Offline
Campfire Regular

Registered: 04/13/09
Posts: 1097
Loc: Black Hills, SD
Correct, most seating dies are not hardened. I have used a regular chamber reamer to open seater dies from Redding many times. When I was looking for a faster and less expensive seater solution for wildcats, a Redding tech told me the sliding sleeve on their comp seaters are made from 12L14. They cut easily. I recently opened a .260 Rem seater to .260AI. I turned the reamer by hand and set the depth at .125" with the GO gauge. I've done this more than a dozen times with great luck. Certainly cheaper and quicker to buy a standard comp seater and convert it.

Bob
_________________________
I met a French guy the other day. I asked him "Do you speak German?" He said "No." I said "You're welcome!"

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