RCBS out of spec

ironsights

Private
Minuteman
Oct 7, 2019
34
6
Has anybody had issues with RCBS dies being out of spec? I have a 26 Nosler that after running through the RCBS dies, the shoulder actually gets longer. Press cams over so there is no way to get the shoulder bump. Had a friend run my once fired brass through his dies and get a perfect 2 thou shoulder bump (like I was expecting). Called RCBS and they act like every die they ever made brings it back to SAMMI spec and my chamber is the issue. Anybody have thoughts on this?
 
In a pinch situation... where you are not in a well equipped shop.... here is a suggestion to think about.

If you own the GoGage... gut the die and place the go gage into it, then measure how far the base of the gage protrudes from the bottom of the die. Since the nominal height of a shell plate is supposed to be 0.125", we can tell how much potential bump there would be by the stick-out of the gage.

If the gage doesn't stick out beyond 0.125" then the die is out of spec but can be remedied by a grind to remove enough material to get the bump you need.

Another method is to take a Cerro-Safe casting of the gutted die and allow enough extra material to mushroom on the end to locate the end of the die body, then take a measurement from the base of the die to the headspace datum.
You have to have some skills and at least a caliper to nail this method down because you are trying to resolve a value that is on the order of less than 0.010".
 
  • Like
Reactions: Dstoenner
In a pinch situation... where you are not in a well equipped shop.... here is a suggestion to think about.

If you own the GoGage... gut the die and place the go gage into it, then measure how far the base of the gage protrudes from the bottom of the die. Since the nominal height of a shell plate is supposed to be 0.125", we can tell how much potential bump there would be by the stick-out of the gage.

If the gage doesn't stick out beyond 0.125" then the die is out of spec but can be remedied by a grind to remove enough material to get the bump you need.

Another method is to take a Cerro-Safe casting of the gutted die and allow enough extra material to mushroom on the end to locate the end of the die body, then take a measurement from the base of the die to the headspace datum.
You have to have some skills and at least a caliper to nail this method down because you are trying to resolve a value that is on the order of less than 0.010".
This is what i had to do with 2 forester dies. Then i used the competition shell holder to fenesse the shoulder to where i wanted while still caming over.

David
 
  • Like
Reactions: RegionRat
I had the same experience with a Hornady 308 die and eventually went with a Forster bushing due that works great. You would think they could get a 308 die right, but it wouldn’t bump the case back enough.

I could also, as probably mentioned above, be a slightly tight chamber. That was likely my issue with the Hornady die as it worked on all my 308’s fine except a Savage. That Savage would chamber factory ammo fine, but not my reloads with that die.