Sometimes it's the dies and sometimes it's the rifle. I just got my semi-custom Tikka in 260 and it shoots amazingly well (ragged and enlarged one-holers). The dies I have for it are just standard Hornady dies (sizing and seating). One other relatively new rifle is a Ruger Hawkeye 223 and with it I found that I get best accuracy using the inexpensive Lee Collet Die. I used all sorts of neck and FL and bushing dies to see what let me shoot best. It was the Lee die. Second best was the Redding FL type S bushing die.
If you want really good accuracy, then take the rifles to a good gunsmith and have everything squared up and tuned up. Then tinker with the loads, which you've probably already done.
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