I anneal all brass for my match grade/expensive brass reloads
260 (Long Range Target Rifle)
284 (Fclass gun)
308 (Hunting/Target)
300 WM (Long Range Hunting)
338 Lapua (Longer Range Hunting and Targets)
If you want consistency in your reloads then you have to anneal. But you have to anneal correctly. Correct temperature is a must and you must be consistent in every case. Or your wasting your time and possibly destroying brass.
It all depends what your idea of accuracy is as well. A hunting rifle for shorter range hunting/walking gun etc I would do every few reloads just to keep the brass necks from splitting. Competition brass/match brass I anneal every firing. Trying to keep as consistent as possible. But these are rifles that can hold 1/4 - 1/2 MOA accuracy.
Properly annealed brass = consistent neck tension (very important when running very little tension on your load)
Consistant neck tension = better SD and ES
Better SD and ES = Less vertical dispersion at 1000 Yards +
Which equates to better hit averages, smaller groups and higher scores.
I use a Vertex Bench Source. Anneal every firing. Takes 3-4 seconds per case depending on case thickness
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