[Snake]

Anything non-multi-shot will certainly be deflected only once, then the Desperado will be wide open due to how Bullet Barrier works by default, which is, it only works once at the first attack made at you while Desperado Stance is active.

The 'limitless' part is only to counter-act Quickdraw.

I heavily disagree with Bullet Barrier's condition: 'Can only deflect up to 4 rounds', because Bullet Barrier's role was to already block all and any first-made shots thrown at you. I don't know why Quickdraws are an option to force through it, and it's just cool to see six to eight bullets get deflected in a fancy way.

Can Bullet Barrier deflect two bullets per Rank, then?

Rank 1: 2 bullets
Rank 2: 4 bullets
Rank 3: 6 bullets