Return of Reckoning

Any idea why crits from mobs vary? I tried it on a few and got, e.g., normal hit = 315 (which stayed the same), and then the 437, 483, 461, 448 crits. Obviously I didn't use any buffs etc.

I'm just curious if this is a bug (and whether there's any point reporting) or if there's some mysterious reason I don't know about

base crit dmg is rdm between 40%-60% afaik

Ahh that'd explain it, thanks.