Reddit reviews O1 Tool Steel Round Rod, Annealed/Precision Ground, ASTM A681, 0.328125" Diameter, 36" Length
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O1 tool steel has better machinability than A2 tool steel, and must be hardened in oilMeets ASTM A681 specificationsGround with high precision to the specified shape and sizeStandard tolerance
It appears to be oos now, but I picked these up in the sizes for 5.56,308,9mm, and 22lr and they have worked very well. There is not guarantee they are straight, but mine had no bends in them when rolled on a granite surface plate at a friend's shop.
O1 Tool Steel Round Rod, Annealed/Precision Ground, ASTM A681, 0.328125" Diameter, 36" Length https://www.amazon.com/dp/B0050RIPVY/ref=cm_sw_r_cp_apa_i_Yz0zDbMP4MB5P