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Just like reloading for anything else. You'll be able to neck size a few times then the shoulder will need bumped back. My experience with the RPR is the chambers are sloppy and if you set dies up per instructions you will have relatively short case life.
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That's an interesting observation. I'm sorry that you've had that experience as mine has been the complete opposite. My bud and I each got at RPR in .243 last year, the serial numbers are about 1000 different. They are definitely early first generation guns.
We bought 200 pieces of new Lapua brass. Using the Hornady tool, I measured the factory-set headspace of this new Lapua brass. I then measured several pieces of brass after firing them in the chamber of both rifles (one set of brass for each rifle - kept separate), and I found that with my tools with a resolution of only .001", I could not measure a difference between factory virgin brass and once fired brass in those chambers. Ruger advertises these rifles as 'zero headspace' and my measurements have shown this to be accurate. If I could measure with a resolution of .0001" then maybe I might see a difference.
I repeated this exercise with a new lot of Winchester brand brass with the same results in both rifles.
The Lapua brass is on its 5th loading now and I have yet to touch the shoulders. I'm using the Lee collett neck sizer. Both of lots of brass still chamber easily.
Interestingly, the throat is in the same place on both rifles too, within .001" anyway. I used the Hornady comparator tool to find the CBTO measurement touching the lands with the 105AMAX, 107SMK, 107CC, and 105Hybrid. Both rifles measure within .001" for CBTO with the same type of bullets.
I've never been much of a Ruger fan. But these two rifles are amazingly consistent, especially for the cost. They like the same loads exactly. They shoot the same groups consistently (3/4MOA with Hornady and Nosler, < 1/2MOA with SMK, and pretty much 1 hole with Berger).