How accurate is neck sizing

603 , That makes sense . If you'll likely need to FL size every other or every load due to the higher pressures . The collet die would not be of much use .
 
I use the wrong Lee collet die as a decapping die.

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I use the wrong Lee collet die as a decapping die.
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Interesting you say that . Although not the same I use my 308 collet die to decap some of my 308 brass . Redding has confirmed to me through emails that there Types s bushing dies can/will wrongly size necks if the necks need to be sized down more then .008 . Meaning if you need to use the .336 bushing but the necks of your pre-sized fired brass measure .344 or more you get this . What I call belling where the center portion of the neck is actually sized down MORE then the bush size .

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So now I size the necks down to .337 or .338 using the collet die first before running them through the bushing die . This also decaps the brass at the same time . Some would consider this an extra step . How ever I decap my brass first to run through the wet tumbler . So for me it's not actually an "extra" step . If I can find it I'll post Reddings reply to my emails regarding my bushing die issues .
 
What , something's going screwy here. Some N/S some F /L size. What ever works for you is best. OK, who uses JB Compound & how often.
 
Metal, it wasn't you but the post before you, You post faster then me. I sized with the Redding die also in two steps first with the neck die with a .339 then full size die with .336 Problem with the bushing dies my runout was ave. .003 Then I changed back to my first standard nothing fancy F/L die from RCBS, ave. runout .001 size in one step, works fine for me.
 
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