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Brass Prep for Load Development

I have been developing a load for my 260 using fired Lapua brass recently. My standard process is to use a body die to bump the shoulder. 002, then neck size with a bushing die (if loaded round neck OD is .294, I'll use a .292 bushing). I've had pretty good results with about .00005-.001 runout. I intend on using these rounds for LR shooting and matches. I've just about dialed in the load and have 300 new pieces of Lapua brass that I want to mass produce it with. However, I have concerns of how I should prep the brass because the neck tension is undoubtedly going to be greater than I typically use. And I'm pretty sure the shoulder has been pushed back further than I use as well. What is the most efficient way to address these issues or is it not worth worrying about? Thanks in advance.

Dan
 
I was just researching this the other day. Was going to buy the gen ii sinclair body die. But for the mandrel I've read some use carbide some stainless. Any recommendations?
 
I just neck size and load 'em. Of course some of you may get better accuracy than I do, but 5 shot groups 3/8" to 5/8" @ 100 yards is good enough for me.
 
get close with new brass and fine tune on fired. Take the load you have developed and shoot it in the new brass. If it is Fclass shooting then all I would expect in worst case is a reduction in x count.
 

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