Could you elaborate on the donut maker comment? I'm Using a redding bushing die for 338 and started to observe what I think are now donuts on some 5x reloaded BH's brass that I've been suspecting is from the bushings.
OD on fired cases was .371 and I was using a .366 size bushing when sized as measured out. I've recently been playing with a two step process of starting higher and getting to .366 to see if it alleviates it with other brass but so many steps are a PITA.
I understand what turbo is saying, but my redding bushing dies have an expander ball that, IMO, ensures that the neck is not compressed beyond a certain point. Granted it will still likely result in slightly different neck tension for different thicknesses of necks and unnecessary cold working of cases with thicker necks, but so will a non bushing die.
I agree, a $20 rcbs is 'fine'. My choice to use the bushing dies is is that i use little to no lube with the nitrided bushings, its effortless to cycle the press, and no 'jaw marks' on the neck.
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If you take the bushing out of the die, you'll see it's beveled a little, so you can see it can't size the neck all th way to the shoulder, no matter how far down you screw the die in.
Then if you set the bushing to move or center a little bit, as per instructions, you get more the neck not being sized.
With the numbers you qouted, I don't think it's a problem with your gun. Going to .366, means with a seated bullet, it probably measures .368, or .369, so only .002" expansion, that's actually tight, a good deal. And your donut, if there, should really never cause a seating issue.
I have two 6.5x47's, loaded round measures .288", neck is reamed to .293", that's .005", you can see the difference.
If you need more info, pm me and I'll try help.