Not Jordan, but I have used the 1000.
Hard question to answer, because the answer is not always the same.
Light is the enemy of LRF, so bright sunshine and snow can be difficult and days of bright sunshine and heavy mirage will limit your distance some. You should be able to laser a deer to 800 yards the majority of the time.
When distances are further a solid rest or tripod is beneficial. I put new batteries in right before the season starts.
Terrain can really screw you up as well, such as a small hump 50-70 yards in front of the animal. You think you are ranging the deer, but really you are ranging that slight rise in the ground. Don't trust your first reading, range multiple times to ensure it is correct. Also don't assume the center of the aiming point is where the laser is actually pointing. Confirm that ahead of time. Maybe the actual center is in the upper left of your circle or square aiming (Different depending on brands).
More to say on the topic, but that covers some things.
Jordan, I am looking at the Leica 1,000. Have you had a chance to see how far it will range deer sized game?