I anneal and all I use is a Lee collet die. That's for my 260/308/300. Use a Redding bushing die for my 338 LM. Would use a Lee collet die but they don't make one (or at least didn't when I needed it).
I tested mine at 300 yards using brass with several firings against brass with same amount of firings, but annealed. Same exact process for all the brass involved. Same gun same lot numbers everything. The brass that was annealed shot smaller group, (1/2 moa vs about 3/4 moa) it also cut the spread in velocity almost in half. 38 fps (5 rounds not annealed) vs 20 fps (5 rounds annealed). I anneal every time I reload. I have a vertex machine tho. Using a drill/torch or something of that nature would take way longer. The machine anneals 1 piece of brass every 4 seconds.
This is match grade barrel and components. I anneal for my factory barrel to (only have 1) just because it's to easy not to. Don't get split necks but I have no idea of accuracy gain with that barrel as I Havnt tested that
Keep in mind the collet die only sizes your brass about .0015" (hope that's right) under bullet size. As in my 308 case inside neck diameter is .3065 when sized. You can't have much spring back on the brass before you loose the bullet tension.
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