More on being blocked capped after the jump.
First of all I should mention the old tried and true uncrushable macro is now our block cap macro.
/script DEFAULT_CHAT_FRAME:AddMessage("Need 102.4 combat table coverage. Currently at: "..string.format("%.2f", GetDodgeChance()+GetBlockChance()+GetParryChance()+5))
Remember, raid buffs will help - Horn of winter adds 2 to 3% avoidance to the top. Just getting near 102.4% is your best bet. Mastery currently is the easiest way to being blocked capped, however you do not want to give up pure evasion just to be block capped. Also keep in mind that dodge and parry are subject to diminishing returns. Those numbers (thanks Theckhd at maintankadin) are as follows;
Parry: 21.21% or 931 rating.
It is alright to be slightly under these numbers, but anything above these could be better spent in other places, like mastery. So in the end you should try to be around these values and have about 40% block without holy shield active. If you have anything left and don't know what to do with it, throw it into hit or expertise if you are not at 8% hit or soft capped 26 expertise. I'll get into those in a future post.