Protein-histidine N-methyltransferase that specifically mediates 3-methylhistidine (tele-methylhistidine) methylation of actin at 'His-73'. Does not have protein-lysine N-methyltransferase activity and probably only catalyzes histidine methylation of actin. L-histidyl-[protein] + S-adenosyl-L-methionine = H(+) + N(tele)-methyl-L-histidyl-[protein] + S-adenosyl-L-homocysteine The SET domain specifically recognizes and binds actin, suggesting that it does not accommodate substrates diverging from actin. Belongs to the class V-like SAM-binding methyltransferase superfamily. SETD3 actin-histidine methyltransferase family.