I was having a conversation with a hunter this morning, and we was more than adamant that it simply wasn't possible, regardless of sockets and legendary ring.
I, however, was sure that it must be possible, with the absolute best gear (mythic WF with sockets). So, i got slaving away.
I calculated the following;
Food = 125
Gems on EVERY piece (excluding Maalus) = 1050
Enchants = 275
Mythic WF gear with 735 ring = 2238
Mythic WF gear with 795 ring = 2368
Total with 735 ring = 3688
Total with 795 ring = 3818
that is all excluding the 5% crit buff we get.
with it;
Total (735) = 3872.4
Total(795) 4008.9
Now, the conversion rate is very close to 110. so:
With 735 our crit stat gives us 3872.4/110, which is 35.2036%.
With 795 out crit stat gives us 4008.9/110, which is 36.4455%
now, with our base 15%, and a raid buffed 5%, that totals:
735 = 55.2036%
795 = 56.4455%
So, it is in-fact possible to hit the soft Crit cap, but, you do need outrageously good gear, and, by the time you have it, you really wouldn't care. Everything must be Mythic warforged with a socket (with the BiS gear), the % chance COULD be higher, by using things such and tier gloves and using the Sinister Felborne Helmet, or by using the serrated Demontooth ring, or even the Felcrystal bow instead of the Mannoroth one. It could also be higher through racial bonuses, namely the 1% Touch of Elune: Day bonus
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For shits and giggles, here is how this would simulate, with Lone Wolf and Power Shot (as this simulated the highest on single target.)