No, i definitely fully agree with annealing every firing and sized carefully (0.002" shoulder bump) and seating accurately using good bullets. Seating depth tuning will get you your accuracy.
It was only the removed expander on factory dies i was pointing out isnt the best advice, and isnt at all what that article was saying. There was alot more in his process that was getting that guy his accuracy. Custom reamed sizing die with no expander being part. Obviously you can do this depending on the die brand/style, as you and others clearly are.
I never questioned the accuracy either. I too am a head shooter of deer, when practical. Longest are 400m on a small fallow spiker and 370m on a fallow yearling doe (heads half the size of Reds). Many, many between 100-250m. Using .222 thru to 6.5prc, most with my old ruger .243 pushing 87gr sp bullets.
I reload using dies from 3 different brands all with expanders in. I get great accuracy out of all of them. My 6mm creedmoor (very lightweight hunting rifle) is loaded using basic Lee dies, it shoots 0.5moa groups or better, a couple of groups were one hole while doing a basic load dev.
Measuring accurately using calipers and comparator bushings to get consistent reloads (sizing and seating) and Seating depth tuning will be where the most gains are in your reloads group sizes.
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