Starting a couple weeks ago, I was having issues getting the first shot off in Rapid fire--the buzzer would go off and I'd just sit there, trying forever to get the perfect shot. When it would finally break, I'd only have 7 or so seconds to light off the rest. I don't know what it was, but some first-shot drills seemed to help:
I'd set my (programmable) target to face for two seconds, and start the timer. The target would face and I'd have to get the first shot off and re-cock the hammer (I'm still using revolvers for Bullseye) and start aiming again by the time the target turned away. That seemed to help a little bit.
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I also seemed to be getting into a rut with Bullseye--no matter how much harder I tried, how much more focused I attempted to make my practices, my scores were steadily dropping: 579/600 on Nov. 2nd, 573/600 on Nov. 9th, and finally 571/600 last week. Barely a Master-level score. My slow-fire was suffering (I couldn't get a good follow-through and started throwing shots into the 7- and 6-rings), and my rapid-fire was getting wilder and wilder (there were several shots where I watched the dot zig-zag all over the target, but somehow the shots ended up near the black).
I took a three-day break from shooting--not even switching to other disciplines, like defensive practice or shooting Trap with my shotgun. No live-firing at all. I did go to a 3-day gunshow, walked around the tables for a couple hours each day, and I did touch quite a few guns, but I didn't visit the range, nor did I do any dry-fire practice in my house (I have a section of my house that is about 60-ft long, so I put an aiming black at one end and I would stand at the other, dryfiring at the target).
I'm not going to proclaim myself 'cured', but tonight I shot a 579/600, shooting the weekly match cold both figuratively (I got to the range early, but didn't opt to warm up) and literally (for some reason, the indoor range we shoot at had the air conditioning on, and it was cold enough in there that most of the other shooters wore their jackets to shoot).
Sometimes you just need a break. Once in a while.