Camo your gun as well.
Stay motionless as crows approach, they are extremely keen-eyed and will spot the tiniest motion. However, once they get to a position of about 20-30 degrees from vertical to you on their approach, they are often looking further ahead and not down at you.
If you suspect or know a flock is in the area, don't shoot the first solitary crow into your set. It will often be the flock sentry. Let it return with the all-clear and bring back the rest of the flock.
Be aware of the three levels of crow security: Treetop perched sentinels which are very hard to spot as you enter an area, treetop silent drifters which ghost along at low altitude, and high-altitude overwatch flyers.
Stick with high-base #6 loads, they will kill at longer ranges rather than just breaking the near-side wing as smaller shot often does, and they also work well shooting up through leafless branches in winter.
Use dead crows as decoys. Drives them crazy.
Learn the crow 'language' and be able to perform it on a mouth call, especially the distress cry.
Try to avoid hunting the same areas the exact same way and times. As you learn crow behavior patterns, they are smart enough to learn yours.
If you spook a flock out of one of its hangout areas and they leave in one direction, set up a couple hundred yards in the opposite direction and wait for them to try to sneak back in via the back door. Again, don't shoot the first sentry.
Observe the wheeling motion by which a crow makes a sharp directional reversal. Your only shot may be as it makes this turn and it's difficult to figure the lead until you see the shape of the maneuver. If you wait until they straighten out, sometimes they'll be out of range.
Vary which vehicles you drive to the hunting areas. Crows can read and remember your license plate. ;-)
Use shells which fire an explosive projectile with a proximity fuse that detonates as it approaches its target. ;-)
