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Message: <blockquote data-quote="Hired Gun" data-source="post: 1210622" data-attributes="member: 1290">You need the proper ultra mag box.  They are different.  A box from the 300wm or 7mm rem mag will do just what you are describing if used on a 26 Nosler.  What do the feed lips fit like?  They must be tighter than the brass is for the first inch.  A 30-06 action doesn't need opened much.  I do the bulk of the work with a 1" wide diamond knife lapping tool and then deburr down to 400 grit so they run real smooth on the brass without cutting it up.  If the brass just drops through, the action is now ready for a Lapua build. If that doesn't work a new action is in order.  No questions, no if, and or buts.  No smith should attempt a custom job he can't afford to make right if he goofs up from his workmanship error.</blockquote>