The .338 RUM alread has a pretty straight case wall. Minimal benefis will be seen by improving it. I'd stick with it until at least the barrel wears out.
Thanks Mark. The 338 Sendero that I have shot in the past in running a full case with 7828 and shoots well for a factory rifle. I didn't know if improving would make any difference. I know some are using a 300 RUM case, but I guess that's a different story.
db
