I think we made our run-in < 1000' (500'?) to the target -- the maneuvers were designed for nuclear deliveries, so all NUKE-capable crews had to maintain proficiency and get an annual "certification" on the drops as part of SIOP ....
Some BULLS were obtained -- I got one ... but in general, not a "real accurate" delivery ... but then 1/4 of a mile ain't bad w/ a NUKE. LABS IP and LABS TGT were two of the "BULL" categories on the side of the SKYWARRIOR Theater @ NUW for the monthly bombing competition(s).
Bottom line: a gut's-ball delivery for NUKES and not too particularly accurate. You could almost smell the fear on the radio from the guys in the rake shacks when one would commence a LABS run ...
I was the Nuke Weapons Training Officer in my first squadron when we were tasked to drop two B-43 on a test range @ Eglin. This was a QAST delivery - Quality Assurance Service Test, basically they took a real no-$hit B-43 off the shelf, took the "good" stuff out and replaced it with ballast and telemetry equipment, and then made you go through the entire sequence from break out of the magazine, to loading, to delivery. They told you how to deliver - one Visual LAB IP, one visual LAB Tgt. They then recorded your 200' run-in and delivery profile, and when the weapon came off the aircraft, they recorded the flight trajectory to impact. They directed airbursts for each weapon, so at prescribed "burst" altitude, a smoke charge ignited so they could compare actual "burst" against desired "burst." Finally they recorded your impact spot relative to the target. Whole process was to provide assurance that the "special" weapon program would work as advertised if called upon.
I didn't fly the profile - two other crews got that good deal, but I was the guy in the hot seat if anything went wrong (me and the CO, because it was one of those events that could get a guy relieved if performed poorly). The day of the flight the Skipper asked me how well I thought it would go (I had been up all night while the maintenance guys were doing wire checks and pro-loads. He found me sleeping on his couch when he came in that morning). Being a cocky JO I told him I was so confident I had sent an official notification to the Wing that we were going to COMPEX the crews in Visual LAB IP and Visual LAB Tgt. He gave me one of those looks...
Bottom line, both scored Es, both inside of 500'. If you understand all that goes into "committing" as you fly over a visually significant IP (or Tgt), then the math required to determine the count down timer delay prior to executing a 4G pull to intercept 16 units AoA, then keep wings level as they try to walk as the pilot goes over the top at less than 200 kias, topping out at about 10k feet on your back, upside down, you'll realize how lucky we were that day! Plus all the avionics required to successfully provide the pull-up cues, potential for ballistics computer failure, parachute failure, etc, etc.
But, I can tell you a day like that will make or break a career - that's one of the great things about the Navy, and you should strive to be the guy who gets chosen to be placed in those situations. It means you've gained the confidence of the old man.
Side note - my last flight, last pass at Dare Bombing Range, on May 19, 1993, was a night hi-loft w/ a run in at 500kts, 500' AGL, in IMC (fog) just to prove I still had the stones to do such stupid stuff. My pilot was not too thrilled, but he did it for me. It wasn't a bulls' eye, but it was inside 100', which is just fine when dealing death in the mega-tonnage range...