Raid bosses in tier 3 uses a CpM value of 0.73 which is very close to a level 30 pokemon (which has a CpM value of 0.7317).
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Thanks
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This was Just posted on tsr reddit, has the info you need:
https://www.reddit.com/r/TheSilphRoad/comments/6r4tee/info_various_raid_counters_damage_breakpoints/