Thanks @grandpamac,
I have factory RWS brass with the thick neck and Redding 3 die set.
I haven't measured the reamer yet but I'm assuming it's the correct one for the thick neck brass, it came in a package with the brass and dies.
The barrel is a 24" 1:9 twist so probably looking at around 70gn projectiles or heavier if they will stabilise.
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