I just got a Redding type S die for my .308 and my fired brass measure 0.340 OD neck diameter. My loaded rounded OD is 0.335 so I got a 0.334 and 0.333 neck bushing. I’m reading that sizing more that 0.005” at a time can induce more runout. Using the 0.334 bushing, I’m sizing 0.006”... do you see this as a huge problem or should I get a bushing that’s half way and do the two step method? I don’t shoot competitions or anything and it’s mainly for hunting or just shooting long range for the fun of it.
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Also I load 7 mm Remington Magnum and when I next size down from fired brass the work that is done is .014”to get to my .003” under loaded neck ID And like I mentioned the only thing I noticed that was the a bad thing with that much sizing is the neck wall thinning out faster and not really any runout issues.
I’ve never noticed more run out by neck sizing like that. But when I next size, one way ive noticed that really helps consistency is to anneal after every firing and I use the AMP annealer (annealing make easy)(induction annealing).And personally my method is using a bushing and followed up with an expander mandrel. It’s important that these 2 methods are done separately for the least amount of runout and some dies has then all in one and if used it’s possible to see bad runout with those. Anyways , Ill use a bushing thats .003” under loaded neck ID then use an expander mandrel to open it up .001” which theoretically should be .002” under loaded neck ID. I found that you will get consistent neck tension finishing up with the mandrel. And long as you and anneal after every firing your brass won’t need to work as hard to resize it back down so there shouldn’t be any run out issues. But also you don’t want to much neck tension because you can stretch out the brass very quickly and thin out the neck wall over time with many resizings. I would recommend .0015-.003” for bolt action.