Don't forget the .223 ammo's AC mod. It's -20 and the enemy's 15 AC, so his AC will count as 0.
6 PE, .223 Pistol, no onehander perk, 30 hex range, your strenght is enough, no AC for the enemy - the unaimed attack needs 183% SG for 95% tohit at unaimed shot. If the enemy has 35 AC, so after the ammunition modifier it will be 15, then yes - you will need 198%.