Thread: Substituting projectiles

Originally Posted by PipIstrelle

It makes absolute sense .

A full length die sizes in the order of , outside neck diameter, body /web , shoulder then inside neck diameter. If the die squeezes the body before the shoulder engages the case will grow in length. Similar to squeezing a balloon. It's quite a common phenomena and quite possibly effects some dies more than others , both my 243 and 223 hornady dies will do this my 6.5 Creedmoor, Forster bump die won't , probably because it's not designed to body size .
Just a quick example , I use Redding competition shellholders, I use them because it's easier to achieve consistent sizing . Sizing fired 243 cases and using the +0.010" shellholder the cases grew by 0.001 to 0.002 " , using the +0.008" the shoulder would remain pretty much as were and the +0.006" shellholder gave a consistent shoulder set back of 1 to 2 thou" . All measurable and the cases sized with the +0.010" were difficult to chamber . The growth occurs in the head to shoulder measurement.
I anneal, so none of the case growth can be attributed to spring back .
I'm really surprised you haven’t come across this , it seems to be a recurring question on The Stalking Directory forum . Sometimes it can be attributable to the dies or shellholder, generally it appears to be poor die set up .

forth line.....other than tiny bit of length at neck...yes I understand the balloon concept..... but your not doing F all squeazing here are you...... thats the whole point of doing it that way,to leave case as close to chamber size as possible..to do less work to brass,to make it last longer and be better fit for the chamber it came out of.


and you dont come across something if you dont look for it...like poor velocity in a very accurate and great killing load..no chronograph = no problem

there is a very old saying in back country... a dead possum in the water tank isnt a problem untill you tell someone.