I had a learning curve when I went to .308 precision shooting. I also went from .223 to .308. Took a LOT more to get a good position and to repeat it. The extra recoil also meant I got tired faster. One reason I got a 6BR was the recoil factor. I shoot mostly cast bullets in the .308 now.
One thing I did was to go to lighter bullets. I stuck with 155's instead of the 175's. While I liked the 175's for 1000yd shooting the recoil did not make me happy. I even considered going to 125's for closer range work (300yd). But, cast bullets work so well for me that I haven't done that yet :)
But...my model 12 did not shoot that great out of the box. I was lucky to get less than 2" out of it. I found out it was a copper mine and did not like it. It was also temperature sensitive. When cleaned of copper (every 50 rounds or so) it did well. Temp was monitored loosely (with my hand :) ). I could have named it Goldilocks. Not too hot, not too cold :) FWIW, with cast bullets it is almost as sensitive to temps, but, they are more tolerant of powder fouling.
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