Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Techniques For Reloading


Reply

sizing die help

 
LinkBack Thread Tools Display Modes
  #8  
Old 07-13-2013, 09:25 PM
Junior Member
 
Join Date: Jul 2013
Location: VA
Posts: 6
Re: sizing die help

Thanks for all the answers. Im prob just gonna go with a FL die set. Anyone used the RCBS competition dies?
__________________
Aim small, miss small
Reply With Quote
  #9  
Old 07-14-2013, 10:20 AM
Platinum Member
 
Join Date: Dec 2005
Posts: 2,113
Re: sizing die help

Sierra Bullets has got best accuracy by full length sizing all their cases used to shoot their bullets for quality control. Same for load development in factory rifles shooting their bullets. They've been doing it since the 1950's.

Best results are with dies whose neck diameter is a couple thousandths smaller than a loaded round's neck (no expander ball used) and its sized all the way back to the shoulder. The fired case body is sized down a bit and the fired case shoulder's set back a thousandth or two. If this ain't done correctly, then such full length sized cases may well not shoot as well as neck only sized ones; expecially when the fired case shoulder's set back way too far.

Note that bottleneck cases headspacing on their shoulders center perfectly in the chamber when fired regardless of how much clearance there is between the case body and neck to the chamber in those areas. It's the case shoulder that centers the case up front in the chamber shoulder, not the body or neck. Case necks float clear of the chamber neck regardless of clearance and are very well centered there if they're well centered on the case shoulder. Case body's are clear of the chamber wall except for its back end at the pressure ring where the extractor pushes it against the chamber at that point.

Neck only sizing dies do not center case necks on case shoulders as well as full length sizing dies do. This is why most benchresters now full length size their fired cases, but only a minimal amount. Their smallest groups didn't get any smaller but their largest ones sure did.
Reply With Quote
  #10  
Old 07-14-2013, 11:23 AM
Platinum Member
 
Join Date: Dec 2011
Location: S.E. Michigan
Posts: 3,274
Re: sizing die help

Quote:
Originally Posted by spanky0043 View Post
Thanks for all the answers. Im prob just gonna go with a FL die set. Anyone used the RCBS competition dies?
Me. Bushing F/L sizer and front load seater. You can stuff the Forrester and Wilson somewhere not mentionable.

I don't load your caliber but if I did, for me it's a no brainer.
__________________
'It's not about me, it's about we'..........
Reply With Quote
  #11  
Old 07-14-2013, 12:49 PM
Platinum Member
 
Join Date: Dec 2005
Posts: 2,113
Re: sizing die help

I've used RCBS comp. dies in .308 Win. The seater's a good one but then so is any seater when case necks are minimally sized down without using expander balls and they're straight on the case shoulder.

RCBS comp. dies I've used were great but I lapped their necks out to a couple thousandths smaller than loaded round neck diameters. Those darned expander balls are mis-named; they should be called "neck bending" balls 'cause they tend to bend them.
Reply With Quote
  #12  
Old 07-14-2013, 06:47 PM
Platinum Member
 
Join Date: Dec 2011
Location: S.E. Michigan
Posts: 3,274
Re: sizing die help

Quote:
Originally Posted by Bart B View Post
I've used RCBS comp. dies in .308 Win. The seater's a good one but then so is any seater when case necks are minimally sized down without using expander balls and they're straight on the case shoulder.

RCBS comp. dies I've used were great but I lapped their necks out to a couple thousandths smaller than loaded round neck diameters. Those darned expander balls are mis-named; they should be called "neck bending" balls 'cause they tend to bend them.
Bart..

I always enjoy reading your replies, you are wise beyond your years (Ithink at least because I have no idea how old you are)....

I probably should have included that I remove the elevated expander ball and replace the assembly with the N/S stem. The N/S stem expander has a tapered lead up instead of the ball.
__________________
'It's not about me, it's about we'..........
Reply With Quote
  #13  
Old 07-15-2013, 07:43 PM
Platinum Member
 
Join Date: Dec 2005
Posts: 2,113
Re: sizing die help

Quote:
Originally Posted by SidecarFlip View Post
I probably should have included that I remove the elevated expander ball and replace the assembly with the N/S stem. The N/S stem expander has a tapered lead up instead of the ball.
That's what most folks do with full length bushing dies.

I would have liked to see both Redding and RCBS to make their bushings a tight fit in the die as well as positioned to size the fired case neck all the way back to the shoulder. Sized case necks are better centered on case shoulders when this happens. These dies are really "partial neck sizing shoulder bumping body" dies because of the coupld hundredths inch of the case neck that doesn't get sized. Although the difference is small, it doesn't seem to matter much. Especially When Sierra Bullets uses Redding full bushing dies on all cartridges they're made for testing their bullets; standard Redding FL dies for all the rest.
Reply With Quote
  #14  
Old 07-15-2013, 10:02 PM
Junior Member
 
Join Date: Jul 2013
Location: VA
Posts: 6
Re: sizing die help

Sorry but im new to precision reloading and dont know much about bushing dies. but If I decide to go with a fl bushing die, how do I know what size bushings to use?
__________________
Aim small, miss small
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Current Poll
Have You Ever Backpack Hunted?
YES - 62.14%
965 Votes
NO - 37.86%
588 Votes
Total Votes: 1,553
You may not vote on this poll.

All times are GMT -5. The time now is 01:27 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC