Figuring out a new Method

[rstanforth]

One of the reasons that there are so many different opinions is that you end up with the same goal achieved.

If you full length size all brass after fire forming you are essentially making all cases sized "consistent" size. This is the exact same goal as bumping thr case shoulder back. All you are wanting is "ALL" Brass for the gun to be consistent size.

There are a few advantages to bumping, such as less brass stretch from firing ro firing and the potential for a small increase in case capacity. The former, being the biggest advantage for those that do not anneal, keeping the brass cases from moving / stretching to give it longevity.

As mentioned if your chamber is tight and the cases do not or only stretch an extremely small amount, then neck sizing, not full length sizing or bumping is ideal.

Ex: I have a 6.5PRC with a custom RW Snyder barrel. After firing the cases in the chamber the first time, I could not see any difference in the measured fired and New cases remaining. So I will neck size only, to ensure that I do not over work the cases in the sizing process. However, I have Remington and Savage rifles that I have to bump, because the chambers are all crazy sizes and I don't want to over work the brass, so I bump the cases for uniformity.
Just my experience.

 

[Sweetroels]

If your die is a true neck sizing die then it will not, should not bump the shoulder. It is neck only. You may be able crank it down to get some shoulder movement but it could also bulge the shoulder because of lack of case support.


I tumble, anneal, lube, size with RCBS Full length Bushing die, expander mandrel, tumble, prime, load powder with Autotrickler 4, Forster Micrometer seating die to seat bullet. Moving to my XL750 to cut down on shoulder wear, mine not the cases.

Jamie, appreciate the answer, this is what I was looking for. I did a lot of research and and searching per Bob's suggestion and still don't understand why use a full length sizer (I have X dies) after fire forming if a die is going to push the full case back to spec? Is there another die to use. You mention bushing die, is this better than the X dies for this process. VinceMule mentions above Forester neck dies will do the trick? Also what expander mandrel do you use. Thanks for the help!