I would say in western oregon where your hunting the dense jungles of the cascade or the rain forrest of the coast range the average shot is 50yrds or less, many of the blacktails i have shot have been less than 30 yrds, the longest was 150yrds thru a clear cut. they are sneaky little critters. I'm sure down in California you would have a longer shot as its more open country. my favorite way to hunt them is still hunting. up here theres not really a good way to spot and stalk as the forrest is too thick.
I think the first eight deer I shot were under sixty yards. It had a lot to do with how I hunted. I've since dedicated a lot more time to glassing and have opportunities out to almost three hundred yards. It is definitely not as wide open as a lot of Colorado.
Thanks for the answers guys. I worked with a guy from Oregon over the summer and he described it as an absolute jungle. He said that he would try and hunt logged areas but he mentioned that the shots were still short. He used a lever action chambered for one of the really small lever calibers but I can not remember which one. It might have been a pistol caliber actually. Would that be legal in Oregon. Sounds like your average shots are shorter but if you go looking for it than you can find shot opportunities pushing 300 yards.
When placing a trail camera don't just look for a well used trail. What you want to do is look for a freshly used trail off by itself that goes from a north facing ridge, thick forest, brushy knob or some other similar bedding area to a food source. Don't forget water sources. Especially in the summer months the deer need water so look for a good trail going down too a creek surrounded by thick cover and place the camera 100 yards up from the water source.
Scent control is very important...