In other words, I can see how good equipment always helps.
How MUCH does it help with a rifle?
The flags change, the clock is winding down, and you have one shot left to put on your record target. You go to the sighter and the bullet is two holes to the left of your first sighter in the original condition. If you have a good rifle, you go to the record target and hold two bullet holes to the right, saving your group. Now you've learned something that a less accurate rifle can't teach you -- which is why plenty of ace wind dopers can look at the flags and KNOW where to hold, without wasting time on the sighter. In fact, most short-range BR shooters use each shot on the record target as a sighter, and as often as not are holding in 5 different places to shoot their group.
Here's a target from a factory BR match shot with my 700V .222 at 200 yards. As you can see from the sighter, I was holding all over the place to keep the record near the 10 ring. [Ignore the .30 cal crossfire on target #1.] If you can't trust your rifle you can't learn to dope the wind or learn table manners.

Any semi-skilled BR shooter can figure out whether a barrel is great, good, OK, or bad in a dozen or two shots. Likewise for a new lot of bullets.
How much does any of this matter? It depends on whether you want to win (or at least be in the hunt).
http://benchrest.com/showthread.php?94197-Understanding-your-competition-benchrest-rifle