Shoulder bump

[Dusty Stevens]

 

[jimmymac]

Somebody better break it to Redding that it's impossible to bump a shoulder.

 

[pirate ammo]

Somebody better break it to Redding that it's impossible to bump a shoulder.

View attachment 1042938

THATS what I've been saying page 18 redding product catalog tech talk has a artical explaining how to use them

 

[mikeeg02]

Somebody better break it to Redding that it's impossible to bump a shoulder.

View attachment 1042938

I like redding shell holders, but I really wish they would mill a slot like the others for primers that come back after firing when our brass is getting tired or if they protrude into the firing pin hole some.

 

[Bart B.]

Redding says each competition shellholder ... is clearly marked to indicate the amount it will decrease case-to-chamber headspace. They claim headspace is the dimension from the bolt face to the case head when the round fires.

From Redding's FAQ pages: For bottlenecked cartridges, headspace is simply the distance between the head of the cartridge case (the end where the primer is inserted) and the front/face of the firearm's bolt when the case's shoulder is positioned against the front of the chamber.

That was true in the late 1800's when all center fire cartridges were rimmed. Things then changed with the advent of rimless bottleneck cartridges.

 

[Prose]

Last night I was sizing some 260 Rem cases and couldn't help but ponder what would happen if @fguffey was in my reloading room with me making sure I was using proper termography.

So here goes.
First, I measured my fired cases with a comparator that measures from a circular datum (when viewed from above) of the case neck to the base of the cartridge. I then placed the appropriate shell holder (so many) into my press and installed the proper sizing die (double checked). I screwed the die all the way in until it contacted the shell holder and then unscrewed it a ways so that I could begin measuring with the goal of making sure my brass was only minimally sized. I took periodic measurements of both the case, and also the distance between the top of the shell holder and bottom of the die. At the particular datum from which I was measuring the "before" measurement was 1.6535.

After the sizing operation, the measurement at the new datum on the new shoulder was 1.651, representing a change of 2.5 thousandths. Afterwards, as I marveled at this new creation (completely different shoulder #amazed), I decided to record this entire feat in my notebook so that I could retell it to all of you today.

"bumped 2.5 thou"

 

[fguffey]

Redding says each competition shellholder ... is clearly marked to indicate the amount it will decrease case-to-chamber headspace.

The reloader must know the length of the chamber, it sounds like Redding has hired a reloader to write their instructions. Before the Redding competition shell holder reloaders with shop skills could size the case to increase and or decrease case clearance or the length of the case from the shoulder to the case head. If a reloader chooses to avoid sizing the case they can do it the old fashion way; they can use a feeler gage to adjust the die off the shell holder.

When using a feeler gage things can get complicated. When adjusting the die in a cam over press reloaders should understand it is different than when the reloader is adjusting the die in a non cam over press. I could say that is the reason the instructions call the cam over press a bump press, I believe I am the only reloader that understand that.

F.Guffey

 

[fguffey]

I like redding shell holders, but I really wish they would mill a slot like the others for primers that come back after firing when our brass is getting tired or if they protrude into the firing pin hole some.

That is one of those things that can not be discussed, if Redding had a technical person writing and advising reloaders on the phone they would tell reloaders the shell holder does not have a slot because they want to protect the reloader from himself. If the primer is not seated they want the reloader to seat the primer before removing from the shell holder.

Some shell holders have slots, some shell holders do not have a slot and reloaders do not have a clue why that is.

F. Guffey

 

[Comrade Terry]

 

[dmoran]

I have shell holders that do not have groves, the manufacturer of my shell holders did not put a groove in all of them to protect me from myself.

Shell-holder manufactures make non-grooved shell-holders to protect @fguffey from himself.

 

[pirate ammo]

Shell-holder manufactures make non-slotted shell-holders to protect @fguffey from himself.

I may be a dumb redneck,but I think the guy was talking about a fired round,if it won't go in a die,I got a hand decapper,slot no slot don't matter to me.
not excacly dumd-35 years captain deep water vessels

 

[fguffey]

I may be a dumb redneck

Pirate ammo, forgive if you thought I suggested anything like that. Most RCBS shell holders can work with .011" primer protrusion. .011" primer protrusion is beyond a no go-gage length chamber.

Again, I have an EK chamber that is .016" longer than a minimum length/full length sized case.

F. Guffey

 

[Eddie Harren]

"There is not one shooter on this forum that can answer your question, there is not one shooter on this forum or any other forum that can bump the shoulder back."

Mr. Guffey, when I first started shooting IBS, 30 years ago, I competed in the Hunter class. I chose a -.200" 308 Win. case that was called a "30 Doggie". I began making cases with Remington URBR 308 brass. I had a die set, made by CH4D, that consisted of a die to move the shoulder back .200" and a trim die to cut off .200" from the mouth of the case. How was this possible according to your statement above?

It makes no difference how much the shoulder was moved whether it was .002" or .200" the shoulder was bumped or, moved back.

 

[pirate ammo]

I like redding shell holders, but I really wish they would mill a slot like the others for primers that come back after firing when our brass is getting tired or if they protrude into the firing pin hole some.

I went back and reread this post,it clearly says after firing,I can't see any reason for a die & shellholder company to protect me fron a enert shell case.
CASE CLOSED

 

[M-61]

I believe I am the only reloader that understand that.

100% CORRECT!

 

[mikeeg02]

I went back and reread this post,it clearly says after firing,I can't see any reason for a die & shellholder company to protect me from a enert shell case.
CASE CLOSED

I started typing a witty comment a while ago. Then I realized it would probably go unnoticed. After all I use one of those mystical Whidden dies that sizes the body, sizes the neck, *gasp* bumps the shoulder back, and dare I say AND knocks out the spent primer. The Whidden Gods have really treated me right to make such a unicorn. I can share the part number if desired.....lol

Meanwhile I just stick with the rcbs shell holder. Since it has the groove milled in it for primers as described above.

 

[pirate ammo]

I started typing a witty comment a while ago. Then I realized it would probably go unnoticed. After all I use one of those mystical Whidden dies that sizes the body, sizes the neck, *gasp* bumps the shoulder back, and dare I say AND knocks out the spent primer. The Whidden Gods have really treated me right to make such a unicorn. I can share the part number if desired.....lol

Meanwhile I just stick with the rcbs shell holder. Since it has the groove milled in it for primers as described above.

as you said a fired case,thats what I read,someone else,no names please read something else,,I've only seen pitchers of those Widdon things,have they got threads?

 

[Dusty Stevens]

it sounds like Redding has hired a reloader to write their instructions.

F.Guffey

I would have hired a cook but thats just me.

 

[Dusty Stevens]

I believe I am the only reloader that understand that.

F.Guffey

You got that right. I wish youd teach us.

 

[pirate ammo]

it all starts with a simple question and then goes to who knows everything about everything.ME,I don't know chicken squat,but I do have a basic knowledge of what I do load.
now I have a hot date with Stormy,,take that Guffster