Shoulder bumping using a neck sizing die ?

pisces · April 20, 2009, 11:11 AM

I normally just neck size my .17 Rem Fireball cases but after 4 firings they seem a bit tight in chambering - so I've ordered a Redding body die which I'll use for shoulder bumping.

However, in the mean time, is it possible to shoulder bump using my Redding neck sizing die if the shell holder is reduced in thickness by a few thou and, if so, is it possible to buy such modified shell holders ?

F. Guffey · April 22, 2009, 08:21 AM

Pisces, 5 Redding shell holders for $60.00 plus a body die plus a neck sizer die plus the full length sizer die you started with for one caliber? I would use ONE full length sizer to accomplish all of the task $140.00 dollars of equipment can do by using different methods and techniques, one technique I do not use is the guesstimate method for adjusting dies to the shell holder (guesstimate adjustment?) "I adjusted the die about 1/8 turn which is about .015 thousands" which is .001 over a field gage if the guess is correct, which is .010 over a perfect fit for the perfect chamber which is a case + .005 and fits the perfect chamber without slack or movement.. Again, I use a feeler gage to control sizing, or avoid sizing, or neck size, or neck size with partial body support. The difference is, I know the head space before I start, I know the length of the case from the head of the case to the shoulder after sizing meaning I know the effect the shell holder and die have on the length of the case, I know the effect a case has on head space,

Your cartridge chambered when you started 5 firings ago, the case filled the chamber the first time it was fired, if you how much head space your rifle had you could control the shoulder to case head distance by adjusting the gap between the bottom of the die and top of the shell holder. I do not have a press that 'BUMPS' (cam over), I know of one in use, he has a choice, bump-bump, no-bump, all of my presses are 'binders' the ram goes up, that's it, then the press flexes, springs or spreads.

It is possible for a chamber to outgrow the sized case, unless dies are now selling like shoes, length/width, adjusting the full length sizer die without guesstimates can support the body of the case, move the shoulder back and size the neck.

http://www.gun-tests.com/performance/jun96cases.html

F. Guffey

pisces · April 22, 2009, 09:45 AM

Thanks for that.

I'll wait for the body die to arrive.

GeauxTide · April 22, 2009, 01:03 PM

Case length?

pisces · April 22, 2009, 01:26 PM

Possible, but case length checked OK using a Sinclair chamber length gauge.

brickeyee · April 22, 2009, 03:08 PM

A neck die will not have the correct shape to move the shoulder back correctly.

Wait for the correct die.

April 20, 2009, 11:11 AM	#1
pisces Member Join Date: May 23, 2007 Posts: 30	Shoulder bumping using a neck sizing die ? I normally just neck size my .17 Rem Fireball cases but after 4 firings they seem a bit tight in chambering - so I've ordered a Redding body die which I'll use for shoulder bumping. However, in the mean time, is it possible to shoulder bump using my Redding neck sizing die if the shell holder is reduced in thickness by a few thou and, if so, is it possible to buy such modified shell holders ?

April 22, 2009, 08:21 AM	#2
F. Guffey Senior Member Join Date: July 18, 2008 Posts: 7,249	Pisces, 5 Redding shell holders for $60.00 plus a body die plus a neck sizer die plus the full length sizer die you started with for one caliber? I would use ONE full length sizer to accomplish all of the task $140.00 dollars of equipment can do by using different methods and techniques, one technique I do not use is the guesstimate method for adjusting dies to the shell holder (guesstimate adjustment?) "I adjusted the die about 1/8 turn which is about .015 thousands" which is .001 over a field gage if the guess is correct, which is .010 over a perfect fit for the perfect chamber which is a case + .005 and fits the perfect chamber without slack or movement.. Again, I use a feeler gage to control sizing, or avoid sizing, or neck size, or neck size with partial body support. The difference is, I know the head space before I start, I know the length of the case from the head of the case to the shoulder after sizing meaning I know the effect the shell holder and die have on the length of the case, I know the effect a case has on head space, Your cartridge chambered when you started 5 firings ago, the case filled the chamber the first time it was fired, if you how much head space your rifle had you could control the shoulder to case head distance by adjusting the gap between the bottom of the die and top of the shell holder. I do not have a press that 'BUMPS' (cam over), I know of one in use, he has a choice, bump-bump, no-bump, all of my presses are 'binders' the ram goes up, that's it, then the press flexes, springs or spreads. It is possible for a chamber to outgrow the sized case, unless dies are now selling like shoes, length/width, adjusting the full length sizer die without guesstimates can support the body of the case, move the shoulder back and size the neck. http://www.gun-tests.com/performance/jun96cases.html F. Guffey

April 22, 2009, 09:45 AM	#3
pisces Member Join Date: May 23, 2007 Posts: 30	Thanks for that. I'll wait for the body die to arrive.

April 22, 2009, 01:03 PM	#4
GeauxTide Senior Member Join Date: April 20, 2009 Location: Helena, AL Posts: 4,424	Case length?

April 22, 2009, 01:26 PM	#5
pisces Member Join Date: May 23, 2007 Posts: 30	Possible, but case length checked OK using a Sinclair chamber length gauge.

April 22, 2009, 03:08 PM	#6
brickeyee Senior Member Join Date: December 29, 2004 Posts: 3,351	A neck die will not have the correct shape to move the shoulder back correctly. Wait for the correct die.