As a TR shooter ; My TR rifle is a Kelby .308 I've used for four or so years . I'm just getting into Open , and I have a minor issue , in that the rifle I started out with for Open is a Mosin-Nagant chambered gun in 7.62 x 54r . Balistically ; a .308 on mild steroids , but velocities match up closely with a .308 , thus it has a .308 barrel , for bullet availability . It was available , and I cold afford to build it . That being said ; Most of the Open shooters I come in contact with are running .284's , 7 SAUMS , or 300's . All of those calibers are much flatter shooting , with potentially higher normal velocities than the .308 M-N , and I understand I'm giving up a lot in that dept.
So my opinion is that wind reading is more relevant in Open , but only due to the fact that most Open shooters tend to like shooting at 1,000 yards , rather than 600 . Because it does give them a ballistic advantage over a TR .308 ... It's just physics . Not very many mid to heavy weight bullets for .308 that will compete with most Open rifles at a thousand . Not to say there are none , and that it can't be done .
At 600 ; my scores from both rifles are very comparative , but when moving to 1,000 yards , the M-N gives me slightly higher scores , and in my limited experience , I would place this solely on two things . The heavier Open rifle , and the more stable front rest . Their is less felt movement and recoil from the M-N .308 , due to the extra three and a half pounds of gun weight , and the front rest is a much more secure platform to shoot from , than a Bi-pod , of any type .
The arrows do make a difference , Cochise . But both disciplines require equal and relative skill in gun handling , loading and wind reading skills .