First I get everything set up on the rear bag and front rest taking pains to be sure the forend is in the exact same place on the bag and the crosshairs are lined up on the aiming point - this without being in shooting position.
For light kicking rifles up to about .243 or .25-06 or even .260, I let it free recoil. Hold the shoulder a couple inches away from it and hold the grip as loosely as possible, being sure to squeeze the trigger straight back. Generally I pinch the back of the pistol grip with the thumb only touching. I also use a front rest with side screws that can tighten in and somewhat capture the sides of the forend. Some folks even use the trigger pinch, meaning squeezing the trigger with the thumb behind the trigger guard and not touching the grip at all, but that gets kind of painful in the .25-06/260 area as the rifle comes back and bangs the thumb.
On heavier recoiling rifles I get the rifle set up as described above then without disturbing the aim I snuggle in behind the rifle and try to pull it back to my shoulder as straight as possible, and then squeeze as straight back as I can. Everything is done to try to prevent steering the rifle under recoil in any way. Torque seems to be the enemy when you get to the .270/.30-06 level so I will sometimes pinch the forend between my non-shooting hand. It's a bit harder to get a consistent grip that way so you have to really concentrate on it, but when I do get it consistent groups really tighten up and uncalled flyers tend to go away.
I also get all "zen'ed up" before each shot, taking a couple of deep breaths and letting my muscles totally relax with my body in the same position behind the bench each time.
Whether this is the best way, I don't really know but it seems to give me the most consistent results. I think consistency of technique is really the key more so than any one special technique, as long as everything is the same when you squeeze the trigger the rifle should recoil the same way.
