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Third recommendation for neck tension. Am not expanding my case necks, and using comp seater. This balanced with s die for differing brass. Bullets seated to function with mag, consider using hard primer and aware of how some loads balance with the recoil spring/weight/gas port size. Alert to case head swipe.
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Not using the neck expander will create too much neck tension and usually poor accuracy. Spin polish your expander ball using 600 grit wet/dry sandpaper, follow up with 1000 grit for a mirror like finish. I look at .306" diameter as being the maximum allowed for a semi-auto, .305" if .306" doesn't hold the bullet firmly enough to cycle. I would not go smaller than .305".
The brass will harden with use and you may have to go smaller with brass that has been reloaded several times. The expander balls are cheap and easily modified. There is no reason not to have two or three different sizes in your die box.
I use Lake City and IMI brass exclusively in my semi-auto rifles. It's thicker than commercial brass and can handle rough treatment better because of it. A 2.0 full grain reduction in powder charges are required when loading ammo in it.
My favorite bullet is 168 Sierra Match Kings. It's old school, but works in virtually any rifle out to 800+ yards. More tournaments have been won using that bullet out to 600 yards than any other .30 caliber bullet in history.
I just posted suggested loads using Lake City brass in the reloading page of the "Precision Rifle" section. Rather than repost the entire list here, please check it out under the thread titled "308 load advice".