There a few sweeter wines that vary slightly higher in syns but they all seem to average around 28 syns for a bottle of red wine and 26 syns for a bottle white wine.
Tbh I think it can vary quite a bit. I know when I've looked, red wine has ranged from 23 - 29 for a bottle... and thinking about it white varies too (18 - 25 syns), although I do know that a bottle of low alchohol white is about 8 syns