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#6315201 - 05/29/16 10:58 AM shoulder bump 7 Mag
Big Stan Online   content
Bird Dog

Registered: 05/02/14
Posts: 271
I was not able to shoulder bump the 7mm Magnum Nosler brass with the Redding Type S Match full length resizing bushing die. I screwed it in as far as it can go till it has a little firm contact with the ram. Still at chamber shoulder size of 2.112". I also tried with a RCBS full length sizer, still the same. Both are screwed all the way down. Does this case need a body die to bump the shoulders?


Edited by Big Stan (05/29/16 11:00 AM)

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#6315209 - 05/29/16 11:05 AM Re: shoulder bump 7 Mag [Re: Big Stan]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6204
Loc: Wise Co.
If the brass fits your chamber without undue effort closing the bolt, there's no reason to do this. The purpose of bumping the shoulder is to push the shoulder back a smidgen when necessary. Is your brass a tight fit in the chamber of your rifle? Also, are you sure your die is not the neck-only type?
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#6315213 - 05/29/16 11:12 AM Re: shoulder bump 7 Mag [Re: Big Stan]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9398
Loc: Lewisville, TX
Just back the FL die out a little at a time until you get the desired amount of shoulder set back you want. If you screw to die down all the way to touch the shell holder, it will FL size.
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#6315219 - 05/29/16 11:20 AM Re: shoulder bump 7 Mag [Re: Big Stan]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
Your die should do it, it's the same one I use to bump back my 7 Rem Mag brass.

Have you looked into a thinner shell holder?
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#6315239 - 05/29/16 11:45 AM Re: shoulder bump 7 Mag [Re: FiremanJG]
Big Stan Online   content
Bird Dog

Registered: 05/02/14
Posts: 271
Originally Posted By: FiremanJG
Your die should do it, it's the same one I use to bump back my 7 Rem Mag brass.

Have you looked into a thinner shell holder?

No, never have. Just using the standard shell holders that came with the kit 25 years ago.

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#6315283 - 05/29/16 12:51 PM Re: shoulder bump 7 Mag [Re: Big Stan]
Big Stan Online   content
Bird Dog

Registered: 05/02/14
Posts: 271
I was able to bump all my other calibers except the 7 Mag. Maybe I'll do some research on a thinner shell holder.


Went back to the bench and started again with the die in the highest position, and in increments until I made contact with the shell holder, so I screwed it in about a quarter turn and it was a little tight there, but it worked there at .002 bump back. Thanks


Edited by Big Stan (05/30/16 05:31 AM)

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#6315436 - 05/29/16 03:53 PM Re: shoulder bump 7 Mag [Re: Big Stan]
Kill Box ALPHA Offline
Tracker

Registered: 10/29/09
Posts: 734
Loc: Flower Mound, Texas
I'm in the same boat. I have an RCBS die set and it won't touch the shoulder either. There is a die out there for belted mags. Let me look, if I find it, I'll post the link.
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#6315559 - 05/29/16 06:49 PM Re: shoulder bump 7 Mag [Re: Big Stan]
FiremanJG Offline
THF Celebrity

Registered: 12/16/08
Posts: 17893
Loc: Wolfe City, TX
You got it to cam over. All the slack is out of the press, and shell holder. I've got a couple that are set that way. You've got a tight chamber, but not so tight you need a thinner shell holder. Looks like all is well. up
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#6315620 - 05/29/16 08:06 PM Re: shoulder bump 7 Mag [Re: Big Stan]
Kill Box ALPHA Offline
Tracker

Registered: 10/29/09
Posts: 734
Loc: Flower Mound, Texas
Check out the 3rd item down on this page.

http://www.larrywillis.com
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#6315692 - 05/29/16 09:02 PM Re: shoulder bump 7 Mag [Re: Big Stan]
postoak Offline
Veteran Tracker

Registered: 08/19/09
Posts: 2533
Loc: The Woodlands, Tx
I thought to get proper bump back of the shoulder you had to screw the die in further than contact with the shell holder. That is, screw it in until contact, then drop the ram and screw in another turn. Measure the amount of set back you get and then screw out gradually until you get what you want. Another way would be to get contact and then screw IN until you get the set back you want. The latter method has the advantage of not setting some case shoulders too much.

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#6315781 - 05/29/16 09:57 PM Re: shoulder bump 7 Mag [Re: Big Stan]
kmon1 Online   content
junior

Registered: 09/27/06
Posts: 20287
Loc: Texas
Postoak, have been bumping shoulders or just neck sizing with FL dies for years using your latter method. works and like you said not sizing some too much.
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#6315800 - 05/29/16 10:19 PM Re: shoulder bump 7 Mag [Re: Kill Box ALPHA]
ChadTRG42 Offline
THF Trophy Hunter

Registered: 09/16/09
Posts: 9398
Loc: Lewisville, TX
Originally Posted By: Kill Box ALPHA
Check out the 3rd item down on this page.

http://www.larrywillis.com


The collet sleeve sizing die works great on tight chamber magnums. I don't see this being the case on this set up. But the tool does work well when you have to size the area right above the belt where a FL die will not reach.
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#6315910 - 05/30/16 05:29 AM Re: shoulder bump 7 Mag [Re: ChadTRG42]
Big Stan Online   content
Bird Dog

Registered: 05/02/14
Posts: 271
Originally Posted By: ChadTRG42
Originally Posted By: Kill Box ALPHA
Check out the 3rd item down on this page.

http://www.larrywillis.com


The collet sleeve sizing die works great on tight chamber magnums. I don't see this being the case on this set up. But the tool does work well when you have to size the area right above the belt where a FL die will not reach.


I think KillBox Alpha is referring to the Precision Die Shims underneath the collect sleeve sizing die. It's actually the 4th item that he meant, if I am not mistaken. But you are right about the collect die. Looks like the 4th item on that website will work to fix my little issue and to prevent issues down the road. Thanks guys.


Edited by Big Stan (05/30/16 05:29 AM)

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#6315913 - 05/30/16 05:36 AM Re: shoulder bump 7 Mag [Re: RiverRider]
Big Stan Online   content
Bird Dog

Registered: 05/02/14
Posts: 271
Originally Posted By: RiverRider
If the brass fits your chamber without undue effort closing the bolt, there's no reason to do this. The purpose of bumping the shoulder is to push the shoulder back a smidgen when necessary. Is your brass a tight fit in the chamber of your rifle? Also, are you sure your die is not the neck-only type?


RiverRider, the brass chambers just fine before I did that bump, reason is because I felt one of the rounds had a pretty snug bolt at the range, so I felt it was necessary to bump to be on the safe side. The die is a Redding Type S Match full length sizer.

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#6315914 - 05/30/16 05:51 AM Re: shoulder bump 7 Mag [Re: Big Stan]
postoak Offline
Veteran Tracker

Registered: 08/19/09
Posts: 2533
Loc: The Woodlands, Tx
Big Stan, I'm pretty sure he was pointing at the 3rd item, the Belted Magnum Collet Resizing Die, as that is one cure for a full-length sized case that still won't chamber.

Those shims, if I understand their use correctly, are an alternative to backing off the die from its maximum FL location. The thing is, you only have to adjust your die one time (but will probably require multiple efforts to get it set right), if you have only one rifle in 7mm RM. Usually a .003" push back of the shoulder is considered about right. You apparently have some way of measuring this since you mentioned setting back .002". For people who don't, a Digital Headspace Gauge (the 2nd item on that web page) is a good investment.
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