I didn't see a thread for this, so I thought I'd post it here. With the new update they adjusted the cap on Critical Attack Bonus from 50% to 100%. I have my test below:
First test was done outside Abyssea.
Ranger's new Dead Aim trait (+40%) + Brave Grip(3%) + Cavaros Mantle (+3%) + Loki's Body (5%) gives a total of 51%.
http://img263.imageshack.us/img263/6718/rngcrit1.png
273 * 1.25(Crit) = 341 Damage
341 * 1.51(Crit Bonus) = 514 Damage
514 * 1.24(Pierce Bonus) = 642 Damage *Matches*
My second test was done in Abyssea with Crit+ atma.
RR(+30%) + SS(+30%) which gives a total of 111% Critical Attack Bonus
http://img35.imageshack.us/img35/2741/rngcrit2.png
273 * 1.25 = 341 Damage
341 * 2 = 682 Damage *Matches*
This testing shows that despite +111% Critical Attack Bonus, my ranged critical hits were only gaining 100% boost.