I go to my rifle range alot, the ranges that I usually shoot with are 100, 200, and 300 yards is max. Most of my time I spend shooting my 30-06 in remington 7400 or my winchester model 70 black shadow.
My warmups are usually 10-15 rounds at 50 yards, take a 15 min break (cigarette / walk around), then I sit down at 100 yards, and shoot either every bullet I have, or Only 10 and move up to 300 (or 200) but once I get to one of the higher ranges (like 200 or 300) I don't go down or up, I stay there until all my ammo is finished.
And Yes, I do exerpeience "target panic" where I get SUCH NICE groups at 50 and 100 yards, that my mental image says "wow im gonna get great groups at 200 or 300 yards" and..... without noticing my self doing it, I don't try as hard and I tend to flinch the instant I pull the trigger. When I start to get terrible groups at 300 yards (more than 6 inches apart), I either call it quits, OR, I walk it off for 20-30 min, go the bathroom, have a cigarette, talk to girlfriend on the phone, just something to keep your mind off of it. Then go back, sit down, relax, open the bolt, stick an '06 in there, close the bolt, aim, and squeze genetly. Alot of times with me, my groups get smaller right away, and I continue until Im out of ammo