This link:
Competitive Shooting Programs will get you to NRA records. It's awkward to use, but you can find who holds the record for 20 shots rapidfire sitting at 200 yards, or any other score fired in an NRA-sanctioned match. But, that will only get you NRA scores.
For the real show, CMP, I've never found a searchable database other than list of Distinguished Shooters. It's too bad, because I'd like to know what was the highest score shot in the NTI with scope, with irons, with M14, with M1, etc. How many shooters have achieved P100 status. How many shooters from each state have achieved P100, et.