Quote: Is the Bertram brass the problem and maybe I should just buy new Jamison brass?
Hi Aktrap -- Since you asked the important question, please allow me to answer it.
Yes, Bertram brass IS the problem in your case, and WAS the problem for the rest of us who went to Jamison. For years, Bertram brass cases for the 25-20 S.S. (you notice I am only discussing this one caliber) had been the problem up, and until, October 2010, which was the approximate time frame that Jamison introduced their 25-20 S.S. cases for reloaders. Coincidentally with that event, the problem with Bertram went away! That is, those who were fed-up, as it were, with Bertram, simply filled their needs for reloadable brass in 25-20 S.S. by going to the new source, i.e., Jamison.
Logic dictates that anyone who values their time highly, as I do mine, would sidestep the problematic candidate and select the quality candidate.
Best wishes,
Creedmoormatch