Shoulder set back
- Thread starter 762willdo
- Start date
butchlambert
Site $$ Sponsor
WOW! Are you sure your decimal place is right? If so do not use it in your new chamber and never set the shoulder back over .002".
Please don't take this seriously as I just couldn't resist joking about this.
shoot4fun
Gold $$ Contributor
Okay, I'm gonna make a guess or three.
You had a 308 barrel and now you have a new 308 barrel.
You fired brass in the old barrel and now you want to use that brass in the new barrel?
But, this is tricky, your used brass is .005-.007 shorter than what brass fired in the new barrel gives you at the datum?
Answer these questions and maybe we can all get together on what the true question is.
Yes to all
shoot4fun
Gold $$ Contributor
You most likely had what gunsmiths refer to as a zero headspace on the original barrel and the new one may be right on the edge of closing on a No-Go gauge. I have a fantastic shooting 308 barrel on my AIAW that is very similar to your numbers. The big concern initially would not be affects on accuracy but more to the fact the old brass is gonna stretch quite a bit. Maybe not even all the way to the new length in one firing.
Have you already FL sized the "short" brass? If not, back the FL die off a turn, setting the die up to only size down on the body. That should push the shoulder out some and lessen the stretching.
Watch for incipient case separations! That shiny ring around the case near the head means trouble.
Also, do you have some virgin 308 brass around? See how the new compares to the old.
Have you already FL sized the "short" brass? If not, back the FL die off a turn, setting the die up to only size down on the body. That should push the shoulder out some and lessen the stretching.
Watch for incipient case separations! That shiny ring around the case near the head means trouble.
Also, do you have some virgin 308 brass around? See how the new compares to the old.
Coyotefurharvester
Silver $$ Contributor
Do you have a couple NEW cases you can load/ fire, don't bump load and shoot again. Take measurements and see how it compares to brass from the other barrel after each firing. Maybe you were bumping brass from the other barrel and it wasn't fully formed(bolt starts to close with effort).
ronemus
Gold $$ Contributor
QC was lacking on this unless your bolt has worn. Did you use a new bolt or your old one? If it's an old bolt, you should get a new one. My smith requests that I send him the particular bolt I'll be using when he makes the new barrel, allowing him to headspace it exactly. Your headspace is longer than the NOGO gage, but shorter than the FIELD. It's not unsafe, but it is incorrect; I would return the barrel to the maker for exchange or refund, assuming the bolt is OK. The tolerances for bolt/barrel/barrel extension are such that the headspace should be between GO and NOGO gages in the worst case.
This I think sums up my problem..
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