bewsh Posted September 21, 2016 Report Share Posted September 21, 2016 I am new to these dies to be honest used plenty of neck dies but not matched to an external OD should I be expecting any springback from fresh brass when using these bushing neck dies? running a .268 die on new brass and getting an OD of closer to .270 that normal? looks like I will have to drop a size or two Link to comment Share on other sites More sharing options...
Bianchi Posted September 21, 2016 Report Share Posted September 21, 2016 The bushing could be closer to .269 then. Don't know what tolerences Redding manufactures to but presumably any bushing "targeted" as .268 and measured between .2675 and .2685 would end up in the .268 bin with a Gaussian distribution. Link to comment Share on other sites More sharing options...
bewsh Posted September 21, 2016 Author Report Share Posted September 21, 2016 well it measures .268 when measured across the whole depth of the bush either way thats a bounce back I hadnt accounted for Link to comment Share on other sites More sharing options...
palo Posted September 21, 2016 Report Share Posted September 21, 2016 I use redding bushing dies but never had that problem. I have had the opposite a few times where the neck od ended up smaller than the bushing size. That can happen if your chamber is on the large size and the neck gets sized a lot in one go. What size is the neck od on the brass before sizing ? Im not being smart but could there be an expander ball on the decapping rod that is opening up the neck again. Link to comment Share on other sites More sharing options...
bewsh Posted September 22, 2016 Author Report Share Posted September 22, 2016 hi, original OD .271-.272 Final OD .269-270 not a big jump really no expander have it adjusted to size almost to the shoulder angle. That shouldn't make a difference though very odd Link to comment Share on other sites More sharing options...
That bald headed Geordie Posted September 22, 2016 Report Share Posted September 22, 2016 Using my Redding type S bushing die in .284, I get about a thou springback and take that into account in selecting the bushing I want to give me a few thou bullet retention. However when brass hardens the springback could be reduced. Not a major concern for me as I have a few bushings with different diameters to allow for it. Link to comment Share on other sites More sharing options...
bewsh Posted September 22, 2016 Author Report Share Posted September 22, 2016 looks like I need a smaller one then! Link to comment Share on other sites More sharing options...
Big Al Posted September 22, 2016 Report Share Posted September 22, 2016 Remember its the loaded round you need to measure Ed, not just the case after it has been sized. Link to comment Share on other sites More sharing options...
dully1963 Posted September 23, 2016 Report Share Posted September 23, 2016 Hi I find it a bit odd that all the new 6mm br brass I use comes out the box at .2655 so after sizing your brass is bigger than it appears to be at the start so are you using fire formed brass or brand new out the box brass , just a heads up with the old gold box lapua I used a .268 bush but with the new blue box I found that I needed to go to a .266 bush to get a good neck tension . hope this helps a little best regards Andy (dully1963) ps don't forget the bush has a top and a bottom its very slight but it all helps keep things right Link to comment Share on other sites More sharing options...
DaveT Posted September 23, 2016 Report Share Posted September 23, 2016 One key thing that I learned early on about any bit of reloading kit is to measure what you actually get vs what SHOULD have happened.......the end result is all that really matters but oddball results often yield valuable lessons through investigating the 'why'. Link to comment Share on other sites More sharing options...
gunner Posted September 23, 2016 Report Share Posted September 23, 2016 I use Redding and Wilson they all xxx amount stamped on them but they do differ +or- 1-2 thou but never worry as jus use the ones that actually are 1-2 thou smaller than a loaded round ! Link to comment Share on other sites More sharing options...
bewsh Posted September 25, 2016 Author Report Share Posted September 25, 2016 Hi I find it a bit odd that all the new 6mm br brass I use comes out the box at .2655 so after sizing your brass is bigger than it appears to be at the start so are you using fire formed brass or brand new out the box brass , just a heads up with the old gold box lapua I used a .268 bush but with the new blue box I found that I needed to go to a .266 bush to get a good neck tension . hope this helps a little best regards Andy (dully1963) ps don't forget the bush has a top and a bottom its very slight but it all helps keep things right Hi, These are once fired Norma going through their first resize neck thickness is 0.012-0.013" I assumed the bottom of the bush was the one with the slight chamfer to the inner edge Remember its the loaded round you need to measure Ed, not just the case after it has been sized. The loaded round is fine at .270-.271 but my concern is the tension is quite light given the spring back Remember its the loaded round you need to measure Ed, not just the case after it has been sized. Link to comment Share on other sites More sharing options...
Big Al Posted September 25, 2016 Report Share Posted September 25, 2016 So long as the bullets aren't going to move around Ed Ive found even 0.001" of neck tension is plenty. Link to comment Share on other sites More sharing options...
bewsh Posted September 25, 2016 Author Report Share Posted September 25, 2016 well as they say the proof will be in the pudding just over thinking this as I have never had a chamber cut to a specific size or had to go down the route of measuring loaded rounds in order to reload..... exciting stuff! Link to comment Share on other sites More sharing options...
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